Magnetic stability of nano-particles : the role of dipolar instability pockets.
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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 943171
- Report Number(s):
- ANL/MSD/JA-37989
- Journal Information:
- Europhy. Lett., Journal Name: Europhy. Lett. Journal Issue: 6 ; Jun. 2001 Vol. 54; ISSN 0295-5075; ISSN EULEEJ
- Country of Publication:
- United States
- Language:
- ENGLISH
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