{"data":{"id":"10.5061/dryad.v9s4mw76r","type":"dois","attributes":{"doi":"10.5061/dryad.v9s4mw76r","prefix":"10.5061","suffix":"dryad.v9s4mw76r","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"Strandqvist, Nanny","nameType":"Personal","givenName":"Nanny","familyName":"Strandqvist","affiliation":["Princeton University"],"nameIdentifiers":[{"schemeUri":"https://orcid.org","nameIdentifier":"https://orcid.org/0000-0002-4462-9228","nameIdentifierScheme":"ORCID"}]},{"name":"Fitez, Grant","nameType":"Personal","givenName":"Grant","familyName":"Fitez","affiliation":["Yale University"],"nameIdentifiers":[]},{"name":"Heinonen, Olle","nameType":"Personal","givenName":"Olle","familyName":"Heinonen","affiliation":["Argonne National Laboratory"],"nameIdentifiers":[]},{"name":"Schiffer, Peter","nameType":"Personal","givenName":"Peter","familyName":"Schiffer","affiliation":["Princeton University"],"nameIdentifiers":[]}],"titles":[{"title":"Nanomagnet shape effects on magnetic reversal in artificial spin ice"}],"publisher":"Dryad","container":{},"publicationYear":2025,"subjects":[{"subject":"FOS: Nano-technology","schemeUri":"https://web-archive.oecd.org/2012-06-15/138575-38235147.pdf","subjectScheme":"fos"},{"subject":"artificial spin ice"},{"subject":"micromagnetics"},{"subject":"shape anisotropy"},{"subject":"nanomagnetism"}],"contributors":[],"dates":[{"date":"2025-03-22T03:52:59Z","dateType":"Created"},{"date":"2025-05-16T18:46:28Z","dateType":"Submitted"},{"date":"2025-06-13T00:00:00Z","dateType":"Issued"},{"date":"2025-06-13T00:00:00Z","dateType":"Available"}],"language":"en","types":{"ris":"DATA","bibtex":"misc","citeproc":"dataset","schemaOrg":"Dataset","resourceType":"dataset","resourceTypeGeneral":"Dataset"},"relatedIdentifiers":[{"relationType":"IsCitedBy","relatedIdentifier":"10.1103/physrevb.111.184420","relatedIdentifierType":"DOI"}],"relatedItems":[],"sizes":["272853724 bytes"],"formats":[],"version":"2","rightsList":[{"rights":"Creative Commons Zero v1.0 Universal","rightsUri":"https://creativecommons.org/publicdomain/zero/1.0/legalcode","schemeUri":"https://spdx.org/licenses/","rightsIdentifier":"cc0-1.0","rightsIdentifierScheme":"SPDX"}],"descriptions":[{"description":"This dataset contains micromagnetic simulation results exploring how the\n shape of elongated nanomagnets influences magnetic reversal processes in\n artificial spin ice. By systematically varying the island geometry from\n rectangular to elliptical shapes, the simulations reveal how deviations\n from idealized coherent rotation emerge due to curling and pinning of the\n magnetization at the island edges. Furthermore, increasing inter-island\n interactions leads to a more complex interplay between internal\n magnetization dynamics and external coupling effects. These results\n provide insight into the role of shape anisotropy in artificial spin ice\n and offer a foundation for designing nanomagnetic systems with tailored\n reversal properties.","descriptionType":"Abstract"},{"description":"The simulation data in this work was produced using the software\n MuMax3. The Python script used to run the simulations is included in the\n dataset. Two types of simulations were conducted: 1.\n \u003cstrong\u003eMain text\u003c/strong\u003e– In these simulations, MuMax3\n determined the island perimeter. Each hysteresis loop was repeated three\n times to ensure consistency. 2.\n \u003cstrong\u003eSupplementary materials\u003c/strong\u003e – These simulations\n included a roughened perimeter to model fabrication imperfections. Each\n hysteresis loop was repeated seven times, and the results were\n averaged.","descriptionType":"Methods"},{"description":"# Nanomagnet shape effects on magnetic reversal in artificial spin ice\n Dataset DOI: [10.5061/dryad.v9s4mw76r](10.5061/dryad.v9s4mw76r) ##\n Description of the data and file structure This dataset contains raw\n hysteresis loops as well as results for calculating interaction energy\n obtained from numerical simulations conducted using Mumax3. Python scripts\n for running the Mumax simulations, including those for both “ideal” and\n “rough” element perimeters, are also included. ### Files and variables\n #### File: Main\\_Text.zip This folder contains raw data in four\n subfolders, as well as a Python script (bulkrun_ideal_islands.py) that can\n be used to simulate hysteresis loops for nanoelements placed in a square\n lattice with an “ideal” perimeter. * In **bulkrun_ideal_islands.py**, the\n parameters spacingVals, lengthVals, and seeds are left empty for the user\n to alter, specifying the nanoelement spacing, length, and the number of\n times each simulation should use the same parameters. * Each simulation\n will generate a folder with the following abbreviation: pX;aX;lX;sX.out,\n where X represents the user input. This folder contains a text file with\n the information required to plot a hysteresis loop. * In this file, mx and\n my (normalized magnetization along the x and y directions) are located in\n columns 2 and 3, and Bx and By (applied field in Tesla along the x and y\n directions) are located in columns 5 and 6. **Folder Description:** \n **Hysteresis_Loops_Arrays:** This folder contains raw data of hysteresis\n loops for nanoelements in an array. The subfolder names include the\n pointiness parameter (*p*), length (*l*) in nanometers, lattice spacing\n (*a*) in nanometers, and the simulation run (*s*). * Each simulation was\n run three times, hence for each *p*, *l*, and *a* there are folders ending\n with s0, s1, and s2.  **Hysteresis_Loops_Isolated_Islands:** This folder\n contains raw data of hysteresis loops for isolated nanoelements. Like the\n folder above (Hysteresis_Loops_Arrays), the data is contained in\n subfolders named according to the nanoelement pointiness value, length,\n lattice spacing, and simulation run.  * Each simulation was run 3 times,\n hence for each *p*, *l*, and *a* there are folders ending with s0, s1, and\n s2.  **Interaction_Energy:** This folder contains simulated data used to\n calculate the interaction energy between two nanoelements. The data was\n simulated using Mumax3, where the net magnetization is uniform. The .csv\n file has the following headers: length (l) [nm], lattice spacing (a) [nm],\n pointiness (p), coordination, E_fav [J], and E_unfav [J]. * The length (l)\n [nm] column represents the nanoelement length in nanometers, the lattice\n spacing (a) [nm] represents the lattice spacing between the two\n nanoelements in nanometers, and pointiness (p) represents the pointiness\n value of the two nanoelements. * The coordination header represents the\n nanoelement geometry, where “perpendicular” indicates that the\n nanoelements were placed perpendicularly to each other, and “parallel”\n corresponds to when the nanoelements were placed parallel along a\n horizontal line. * E_fav [J] corresponds to the energy when the magnetic\n nanoelements are placed in a favorable alignment, while E_unfav [J]\n represents the energy when the nanoelements are placed in an\n antiferromagnetic alignment. **Magnetization_Maps:** This folder contains\n numpy files for generating the magnetic texture maps obtained using\n save(m) when running the hysteresis loop, and thereafter using mumax\n convert to convert the files to numpy files. * The subfolder names\n represents the pointiness parameter (p), length (l) in nanometers, lattice\n spacing (a) in nanometers, and the simulation run. * Each subfolder\n contains at least three numpy files. The file m001001.npy in each of the\n subfolders represents the data used to plot the magnetization texture maps\n at remanence. * Files with higher numbers, such as m001633.npy and\n m001635.npy in the subfolder p0.0;a280;l180;s0.out, represent the numpy\n files used to plot the magnetization maps at the points closest to\n coercivity and right after coercivity is crossed. #### File:\n Supplementary\\_Materials.zip **Description:**  This folder contains the\n Python script bulkrun_roughEdges_islands.py for running and generating\n hysteresis loops for nanoelements with a “rough” perimeter. * The\n parameters spacingVals, lengthVals, and seeds are left empty for the user\n to alter, specifying the nanoelement spacing, length, and the number of\n times each simulation should use the same parameters. * Each simulation\n will generate a folder with the following abbreviation: pX;aX;lX;sX.out,\n where X represents the user input. * The generated folder will contain a\n text file named table.txt, which contains the information required to plot\n a hysteresis loop. In this file, mx and my (normalized magnetization along\n the x and y directions) are located in columns 2 and 3, and Bx and By\n (applied field in Tesla along the x and y directions) are located in\n columns 5 and 6. ## Code/software * bulkrun_ideal_islands.py is a Python\n script designed to simulate hysteresis loops for nanoelements with an\n \"ideal” perimeter. Running this Python code generates a separate\n mumax script that which mumax will run. * bulkrun_roughEdges_islands.py is\n a Python script designed to simulate hysteresis loops for nanoelements\n with an \"rough” perimeter. Running this Python code generates a\n separate mumax script which mumax will run.","descriptionType":"TechnicalInfo"}],"geoLocations":[],"fundingReferences":[{"schemeUri":"https://ror.org","funderName":"United States Department of Energy","awardNumber":"DE-SC0020162","funderIdentifier":"https://ror.org/01bj3aw27","funderIdentifierType":"ROR"},{"schemeUri":"https://ror.org","funderName":"United States Department of Energy","awardNumber":"DE-SC0024940","funderIdentifier":"https://ror.org/01bj3aw27","funderIdentifierType":"ROR"},{"schemeUri":"https://ror.org","funderName":"United States Department of Energy","funderIdentifier":"https://ror.org/01bj3aw27","funderIdentifierType":"ROR"}],"xml":"<?xml version="1.0" encoding="UTF-8"?>
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  <identifier identifierType="DOI">10.5061/DRYAD.V9S4MW76R</identifier>
  <creators>
    <creator>
      <creatorName nameType="Personal">Strandqvist, Nanny</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-4462-9228</nameIdentifier>
      <affiliation affiliationIdentifier="https://ror.org/00hx57361" affiliationIdentifierScheme="ROR" schemeURI="https://ror.org">Princeton University</affiliation>
    </creator>
    <creator>
      <creatorName nameType="Personal">Fitez, Grant</creatorName>
      <affiliation affiliationIdentifier="https://ror.org/03v76x132" affiliationIdentifierScheme="ROR" schemeURI="https://ror.org">Yale University</affiliation>
    </creator>
    <creator>
      <creatorName nameType="Personal">Heinonen, Olle</creatorName>
      <affiliation affiliationIdentifier="https://ror.org/05gvnxz63" affiliationIdentifierScheme="ROR" schemeURI="https://ror.org">Argonne National Laboratory</affiliation>
    </creator>
    <creator>
      <creatorName nameType="Personal">Schiffer, Peter</creatorName>
      <affiliation affiliationIdentifier="https://ror.org/00hx57361" affiliationIdentifierScheme="ROR" schemeURI="https://ror.org">Princeton University</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Nanomagnet shape effects on magnetic reversal in artificial spin ice</title>
  </titles>
  <publisher publisherIdentifier="https://ror.org/00x6h5n95" publisherIdentifierScheme="ROR" schemeURI="https://ror.org/">Dryad</publisher>
  <resourceType resourceTypeGeneral="Dataset">dataset</resourceType>
  <publicationYear>2025</publicationYear>
  <subjects>
    <subject subjectScheme="fos" schemeURI="https://web-archive.oecd.org/2012-06-15/138575-38235147.pdf">FOS: Nano-technology</subject>
    <subject>artificial spin ice</subject>
    <subject>micromagnetics</subject>
    <subject>shape anisotropy</subject>
    <subject>nanomagnetism</subject>
  </subjects>
  <fundingReferences>
    <fundingReference>
      <funderName>United States Department of Energy</funderName>
      <funderIdentifier funderIdentifierType="ROR">https://ror.org/01bj3aw27</funderIdentifier>
      <awardNumber>DE-SC0020162</awardNumber>
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      <funderName>United States Department of Energy</funderName>
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      <funderName>United States Department of Energy</funderName>
      <funderIdentifier funderIdentifierType="ROR">https://ror.org/01bj3aw27</funderIdentifier>
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  <dates>
    <date dateType="Created">2025-03-22T03:52:59Z</date>
    <date dateType="Submitted">2025-05-16T18:46:28Z</date>
    <date dateType="Issued">2025-06-13T00:00:00Z</date>
    <date dateType="Available">2025-06-13T00:00:00Z</date>
  </dates>
  <language>en</language>
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  <descriptions>
    <description descriptionType="Abstract">
      This dataset contains micromagnetic simulation results exploring how the
      shape of elongated nanomagnets influences magnetic reversal processes in
      artificial spin ice. By systematically varying the island geometry from
      rectangular to elliptical shapes, the simulations reveal how deviations
      from idealized coherent rotation emerge due to curling and pinning of the
      magnetization at the island edges. Furthermore, increasing inter-island
      interactions leads to a more complex interplay between internal
      magnetization dynamics and external coupling effects. These results
      provide insight into the role of shape anisotropy in artificial spin ice
      and offer a foundation for designing nanomagnetic systems with tailored
      reversal properties.
    </description>
    <description descriptionType="Methods">
      &lt;p&gt;The simulation data in this work was produced using the software
      MuMax3. The Python script used to run the simulations is included in the
      dataset. Two types of simulations were conducted:&lt;/p&gt; &lt;p&gt;1.
      &lt;strong&gt;Main text&lt;/strong&gt;– In these simulations, MuMax3
      determined the island perimeter. Each hysteresis loop was repeated three
      times to ensure consistency.&lt;/p&gt; &lt;p&gt;2.
      &lt;strong&gt;Supplementary materials&lt;/strong&gt; – These simulations
      included a roughened perimeter to model fabrication imperfections. Each
      hysteresis loop was repeated seven times, and the results were
      averaged.&lt;/p&gt;
    </description>
    <description descriptionType="TechnicalInfo">
      # Nanomagnet shape effects on magnetic reversal in artificial spin ice
      Dataset DOI: [10.5061/dryad.v9s4mw76r](10.5061/dryad.v9s4mw76r) ##
      Description of the data and file structure This dataset contains raw
      hysteresis loops as well as results for calculating interaction energy
      obtained from numerical simulations conducted using Mumax3. Python scripts
      for running the Mumax simulations, including those for both “ideal” and
      “rough” element perimeters, are also included. ### Files and variables
      #### File: Main\_Text.zip This folder contains raw data in four
      subfolders, as well as a Python script (bulkrun_ideal_islands.py) that can
      be used to simulate hysteresis loops for nanoelements placed in a square
      lattice with an “ideal” perimeter. * In **bulkrun_ideal_islands.py**, the
      parameters spacingVals, lengthVals, and seeds are left empty for the user
      to alter, specifying the nanoelement spacing, length, and the number of
      times each simulation should use the same parameters. * Each simulation
      will generate a folder with the following abbreviation: pX;aX;lX;sX.out,
      where X represents the user input. This folder contains a text file with
      the information required to plot a hysteresis loop. * In this file, mx and
      my (normalized magnetization along the x and y directions) are located in
      columns 2 and 3, and Bx and By (applied field in Tesla along the x and y
      directions) are located in columns 5 and 6. **Folder Description:** 
      **Hysteresis_Loops_Arrays:** This folder contains raw data of hysteresis
      loops for nanoelements in an array. The subfolder names include the
      pointiness parameter (*p*), length (*l*) in nanometers, lattice spacing
      (*a*) in nanometers, and the simulation run (*s*). * Each simulation was
      run three times, hence for each *p*, *l*, and *a* there are folders ending
      with s0, s1, and s2.  **Hysteresis_Loops_Isolated_Islands:** This folder
      contains raw data of hysteresis loops for isolated nanoelements. Like the
      folder above (Hysteresis_Loops_Arrays), the data is contained in
      subfolders named according to the nanoelement pointiness value, length,
      lattice spacing, and simulation run.  * Each simulation was run 3 times,
      hence for each *p*, *l*, and *a* there are folders ending with s0, s1, and
      s2.  **Interaction_Energy:** This folder contains simulated data used to
      calculate the interaction energy between two nanoelements. The data was
      simulated using Mumax3, where the net magnetization is uniform. The .csv
      file has the following headers: length (l) [nm], lattice spacing (a) [nm],
      pointiness (p), coordination, E_fav [J], and E_unfav [J]. * The length (l)
      [nm] column represents the nanoelement length in nanometers, the lattice
      spacing (a) [nm] represents the lattice spacing between the two
      nanoelements in nanometers, and pointiness (p) represents the pointiness
      value of the two nanoelements. * The coordination header represents the
      nanoelement geometry, where “perpendicular” indicates that the
      nanoelements were placed perpendicularly to each other, and “parallel”
      corresponds to when the nanoelements were placed parallel along a
      horizontal line. * E_fav [J] corresponds to the energy when the magnetic
      nanoelements are placed in a favorable alignment, while E_unfav [J]
      represents the energy when the nanoelements are placed in an
      antiferromagnetic alignment. **Magnetization_Maps:** This folder contains
      numpy files for generating the magnetic texture maps obtained using
      save(m) when running the hysteresis loop, and thereafter using mumax
      convert to convert the files to numpy files. * The subfolder names
      represents the pointiness parameter (p), length (l) in nanometers, lattice
      spacing (a) in nanometers, and the simulation run. * Each subfolder
      contains at least three numpy files. The file m001001.npy in each of the
      subfolders represents the data used to plot the magnetization texture maps
      at remanence. * Files with higher numbers, such as m001633.npy and
      m001635.npy in the subfolder p0.0;a280;l180;s0.out, represent the numpy
      files used to plot the magnetization maps at the points closest to
      coercivity and right after coercivity is crossed. #### File:
      Supplementary\_Materials.zip **Description:**  This folder contains the
      Python script bulkrun_roughEdges_islands.py for running and generating
      hysteresis loops for nanoelements with a “rough” perimeter. * The
      parameters spacingVals, lengthVals, and seeds are left empty for the user
      to alter, specifying the nanoelement spacing, length, and the number of
      times each simulation should use the same parameters. * Each simulation
      will generate a folder with the following abbreviation: pX;aX;lX;sX.out,
      where X represents the user input. * The generated folder will contain a
      text file named table.txt, which contains the information required to plot
      a hysteresis loop. In this file, mx and my (normalized magnetization along
      the x and y directions) are located in columns 2 and 3, and Bx and By
      (applied field in Tesla along the x and y directions) are located in
      columns 5 and 6. ## Code/software * bulkrun_ideal_islands.py is a Python
      script designed to simulate hysteresis loops for nanoelements with an
      "ideal” perimeter. Running this Python code generates a separate
      mumax script that which mumax will run. * bulkrun_roughEdges_islands.py is
      a Python script designed to simulate hysteresis loops for nanoelements
      with an "rough” perimeter. Running this Python code generates a
      separate mumax script which mumax will run.
    </description>
  </descriptions>
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