Magnetic materials are usually characterized by anisotropy energy barriers which dictate the timescale of the magnetization decay and consequently the magnetic stability of the sample. Here we consider magnetization decay for spin systems in a d = 3 cubic lattice with an isotropic Heisenberg interaction decaying as a power law with a critical exponent alpha = d and on-site anisotropy. We show that the anisotropy energy barrier can be determined from the ergodicity breaking energy of the corresponding isolated system and that, unlike in the case of nearest neighbour interaction, the anisotropy energy barrier grows as the particle volume, V, and not as the cross-sectional area.

Borgonovi, F., Celardo, G., Enhancement of the magnetic anisotropy barrier in critical long range spin systems, <<JOURNAL OF PHYSICS. CONDENSED MATTER>>, 2013; 25 (10): 1-6. [doi:10.1088/0953-8984/25/10/106006] [http://hdl.handle.net/10807/55505]

Enhancement of the magnetic anisotropy barrier in critical long range spin systems

Borgonovi, Fausto;Celardo, Giuseppe
2013

Abstract

Magnetic materials are usually characterized by anisotropy energy barriers which dictate the timescale of the magnetization decay and consequently the magnetic stability of the sample. Here we consider magnetization decay for spin systems in a d = 3 cubic lattice with an isotropic Heisenberg interaction decaying as a power law with a critical exponent alpha = d and on-site anisotropy. We show that the anisotropy energy barrier can be determined from the ergodicity breaking energy of the corresponding isolated system and that, unlike in the case of nearest neighbour interaction, the anisotropy energy barrier grows as the particle volume, V, and not as the cross-sectional area.
Inglese
Borgonovi, F., Celardo, G., Enhancement of the magnetic anisotropy barrier in critical long range spin systems, <<JOURNAL OF PHYSICS. CONDENSED MATTER>>, 2013; 25 (10): 1-6. [doi:10.1088/0953-8984/25/10/106006] [http://hdl.handle.net/10807/55505]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/55505
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