Journal Article

PreJuSER-3027

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The effect of cell size in calculating frequencies of magnetic modes using micromagnetics: The special role of the uniform mode

Camley, R. E. ; McGrath, B. V. ; Khivintsev, Y. ; Celinski, Z. ; Adam, R.FZJ* ; Schneider, C. M.FZJ* ; Grimsditch, M.

2008
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/11062  doi:10.1103/PhysRevB.78.024425

Abstract: 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Elektronische Eigenschaften (IFF-9)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2008

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