Volume 54, Number 6, June II 2001
|Page(s)||813 - 819|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Magnetic stability of nano-particles: The role of dipolar instability pockets
Materials Science Division, Argonne National Laboratory
Argonne, IL 60439-4845, USA
2 Department of Electrical Engineering and Computer Science University of Illinois at Chicago - Chicago, IL 60607, USA
3 School of Applied and Engineering Physics, Cornell University Ithaca, NY 14853, USA
4 Institute of Microelectronics, 11 Science Park Rd., Singapore, 117685
Accepted: 5 April 2001
We show that the magnetic stability of nano-particles, with regard to magnetization reversal or domain formation, is controlled by dipolar instability pockets. These pockets are regions in which the local dipolar fields (i.e. shape-dependent effects) favor a spin reorientation. Calculated shape-dependent demagnetizing fields coupled with exchange contributions combine to yield the field at which a magnon mode attains zero frequency implying the onset of reversal or domain formation. Calculated switching-onset fields are found to explain experimental data as a function of: material, thickness, aspect ratio, and shape.
PACS: 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects / 75.70.Kw – Domain structure (including magnetic bubbles)
© EDP Sciences, 2001
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