Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy
Microstructures of magnetic materials, including defects and crystallographic orientations, are known to strongly influence magnetic domain structures. Measurement techniques such as magnetic force microscopy (MFM) thus allow study of correlations between microstructural and magnetic properties. The...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2017-05-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4976580 |
| _version_ | 1811269963902615552 |
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| author | Ke Xu Daniel K. Schreiber Yulan Li Bradley R. Johnson John McCloy |
| author_facet | Ke Xu Daniel K. Schreiber Yulan Li Bradley R. Johnson John McCloy |
| author_sort | Ke Xu |
| collection | DOAJ |
| description | Microstructures of magnetic materials, including defects and crystallographic orientations, are known to strongly influence magnetic domain structures. Measurement techniques such as magnetic force microscopy (MFM) thus allow study of correlations between microstructural and magnetic properties. The present work probes effects of anisotropy and artificial defects on the evolution of domain structure with applied field. Single crystal iron thin films on MgO substrates were milled by Focused Ion Beam (FIB) to create different magnetically isolated squares and rectangles in [110] crystallographic orientations, having their easy axis 45° from the sample edge. To investigate domain wall response on encountering non-magnetic defects, a 150 nm diameter hole was created in the center of some samples. By simultaneously varying crystal orientation and shape, both magnetocrystalline anisotropy and shape anisotropy, as well as their interaction, could be studied. Shape anisotropy was found to be important primarily for the longer edge of rectangular samples, which exaggerated the FIB edge effects and provided nucleation sites for spike domains in non-easy axis oriented samples. Center holes acted as pinning sites for domain walls until large applied magnetic fields. The present studies are aimed at deepening the understanding of the propagation of different types of domain walls in the presence of defects and different crystal orientations. |
| first_indexed | 2024-04-12T21:51:24Z |
| format | Article |
| id | doaj.art-ee07ed81b4a64abcb298af80337c325d |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-12T21:51:24Z |
| publishDate | 2017-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-ee07ed81b4a64abcb298af80337c325d2022-12-22T03:15:28ZengAIP Publishing LLCAIP Advances2158-32262017-05-0175056806056806-510.1063/1.4976580231791ADVEffect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopyKe Xu0Daniel K. Schreiber1Yulan Li2Bradley R. Johnson3John McCloy4Washington State University, P.O. BOX 642920, Pullman, Washington 99164, USAPacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, USAPacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, USAPacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352, USAWashington State University, P.O. BOX 642920, Pullman, Washington 99164, USAMicrostructures of magnetic materials, including defects and crystallographic orientations, are known to strongly influence magnetic domain structures. Measurement techniques such as magnetic force microscopy (MFM) thus allow study of correlations between microstructural and magnetic properties. The present work probes effects of anisotropy and artificial defects on the evolution of domain structure with applied field. Single crystal iron thin films on MgO substrates were milled by Focused Ion Beam (FIB) to create different magnetically isolated squares and rectangles in [110] crystallographic orientations, having their easy axis 45° from the sample edge. To investigate domain wall response on encountering non-magnetic defects, a 150 nm diameter hole was created in the center of some samples. By simultaneously varying crystal orientation and shape, both magnetocrystalline anisotropy and shape anisotropy, as well as their interaction, could be studied. Shape anisotropy was found to be important primarily for the longer edge of rectangular samples, which exaggerated the FIB edge effects and provided nucleation sites for spike domains in non-easy axis oriented samples. Center holes acted as pinning sites for domain walls until large applied magnetic fields. The present studies are aimed at deepening the understanding of the propagation of different types of domain walls in the presence of defects and different crystal orientations.http://dx.doi.org/10.1063/1.4976580 |
| spellingShingle | Ke Xu Daniel K. Schreiber Yulan Li Bradley R. Johnson John McCloy Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy AIP Advances |
| title | Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy |
| title_full | Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy |
| title_fullStr | Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy |
| title_full_unstemmed | Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy |
| title_short | Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy |
| title_sort | effect of defects magnetocrystalline anisotropy and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy |
| url | http://dx.doi.org/10.1063/1.4976580 |
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