Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers
Third order Heisenberg Hamiltonian was employed to determine the effect of number of spin layers on magnetic easy direction. 3-D graph of energy versus stress induced anisotropy and angle was plotted to find magnetic easy and hard directions. First values of stress induced anisotropy corresponding t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Faculty of Science, University of Peradeniya, Sri Lanka
2017-09-01
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| Series: | Ceylon Journal of Science |
| Subjects: | |
| Online Access: | https://cjs.sljol.info/articles/7446 |
| _version_ | 1797984405791178752 |
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| author | N. U. S. Yapa P. Samarasekara Sunil Dehipawala |
| author_facet | N. U. S. Yapa P. Samarasekara Sunil Dehipawala |
| author_sort | N. U. S. Yapa |
| collection | DOAJ |
| description | Third order Heisenberg Hamiltonian was employed to determine the effect of number of spin layers on magnetic easy direction. 3-D graph of energy versus stress induced anisotropy and angle was plotted to find magnetic easy and hard directions. First values of stress induced anisotropy corresponding to minima and maxima of this 3-D plot were determined. Then the graph of energy versus angle was plotted at each of these stress induced anisotropy values in order to determine magnetic easy and hard directions. The same approach was applied to find the easy and hard directions for different values of spin exchange anisotropy. Magnetic easy direction gradually rotates from out of plane to in plane direction of the film, as the number of spin layers is increased from 10 to 30. The magnetic anisotropy energy (energy difference between magnetic easy and hard directions) gradually increases as the number of layers is increased. However, the angle between easy and hard directions doesn’t change considerably in this range of thickness. Our theoretical data agree with experimental data obtained by some other researchers. Easy axis oriented magnetic thin films are useful in magnetic memory devices due to the higher magnetic anisotropy and higher energy density. |
| first_indexed | 2024-04-11T07:02:21Z |
| format | Article |
| id | doaj.art-5da4e24cec574a65857ba3e9ef3199ae |
| institution | Directory Open Access Journal |
| issn | 2513-2814 2513-230X |
| language | English |
| last_indexed | 2024-04-11T07:02:21Z |
| publishDate | 2017-09-01 |
| publisher | Faculty of Science, University of Peradeniya, Sri Lanka |
| record_format | Article |
| series | Ceylon Journal of Science |
| spelling | doaj.art-5da4e24cec574a65857ba3e9ef3199ae2022-12-22T04:38:36ZengFaculty of Science, University of Peradeniya, Sri LankaCeylon Journal of Science2513-28142513-230X2017-09-014639310310.4038/cjs.v46i3.74465654Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layersN. U. S. Yapa0P. Samarasekara1Sunil Dehipawala2Open University of Sri Lanka, KandyUniversity of Peradeniya, PeradeniyaQueensborough Community College of CUNY, 222-05, 56th Avenue, Bayside, NY 11364Third order Heisenberg Hamiltonian was employed to determine the effect of number of spin layers on magnetic easy direction. 3-D graph of energy versus stress induced anisotropy and angle was plotted to find magnetic easy and hard directions. First values of stress induced anisotropy corresponding to minima and maxima of this 3-D plot were determined. Then the graph of energy versus angle was plotted at each of these stress induced anisotropy values in order to determine magnetic easy and hard directions. The same approach was applied to find the easy and hard directions for different values of spin exchange anisotropy. Magnetic easy direction gradually rotates from out of plane to in plane direction of the film, as the number of spin layers is increased from 10 to 30. The magnetic anisotropy energy (energy difference between magnetic easy and hard directions) gradually increases as the number of layers is increased. However, the angle between easy and hard directions doesn’t change considerably in this range of thickness. Our theoretical data agree with experimental data obtained by some other researchers. Easy axis oriented magnetic thin films are useful in magnetic memory devices due to the higher magnetic anisotropy and higher energy density.https://cjs.sljol.info/articles/7446heisenberg hamiltonian, third order perturbation, magnetic easy axis, spin layers |
| spellingShingle | N. U. S. Yapa P. Samarasekara Sunil Dehipawala Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers Ceylon Journal of Science heisenberg hamiltonian, third order perturbation, magnetic easy axis, spin layers |
| title | Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers |
| title_full | Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers |
| title_fullStr | Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers |
| title_full_unstemmed | Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers |
| title_short | Variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers |
| title_sort | variation of magnetic easy direction of bcc structured ferromagnetic films up to thirty spin layers |
| topic | heisenberg hamiltonian, third order perturbation, magnetic easy axis, spin layers |
| url | https://cjs.sljol.info/articles/7446 |
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