This title appears in the Scientific Report :
2008
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.78.024425 in citations.
Please use the identifier: http://hdl.handle.net/2128/11062 in citations.
The effect of cell size in calculating frequencies of magnetic modes using micromagnetics: The special role of the uniform mode
The effect of cell size in calculating frequencies of magnetic modes using micromagnetics: The special role of the uniform mode
Using the time evolution of the dynamic magnetization, we study the frequencies of spin excitations in small ferromagnetic bars with particular attention to the uniform mode. The calculation is done using micromagnetics, and the frequency of various modes is found as a function of the cell size used...
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Personal Name(s): | Camley, R.E. |
---|---|
McGrath, B.V. / Khivintsev, Y. / Celinski, Z. / Adam, R. / Schneider, C. M. / Grimsditch, M. | |
Contributing Institute: |
Elektronische Eigenschaften; IFF-9 JARA-FIT; JARA-FIT |
Published in: | Physical Review B Physical review / B, 78 78 (2008 2008) 2 2, S. 024425 024425 |
Imprint: |
College Park, Md.
APS
2008
|
DOI: |
10.1103/PhysRevB.78.024425 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Physical Review B
78 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/11062 in citations.
Using the time evolution of the dynamic magnetization, we study the frequencies of spin excitations in small ferromagnetic bars with particular attention to the uniform mode. The calculation is done using micromagnetics, and the frequency of various modes is found as a function of the cell size used in the calculation. We find that the uniform mode and some standing spin-wave modes are relatively insensitive to changes in the cell size. In contrast, edge modes and corner modes show significant frequency changes as the cell size is changed in the micromagnetics calculation. These results justify the use of micromagnetics with larger cells to estimate the frequency of the uniform mode of micronsized magnetic bars. A comparison of experiment and theory shows that the micromagnetics estimate is significantly better than the usual Kittel formula with effective demagnetizing factors; however appreciable differences remain. |