Spin relaxation in Mn12-acetate

M. N. Leuenberger; D. Loss

doi:10.1209/epl/i1999-00321-x

Spin relaxation in Mn₁₂-acetate

M. N. Leuenberger^*
, D. Loss

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

90 Scopus citations

Abstract

We present a comprehensive theory of the magnetization relaxation in a Mn₁₂-acetate crystal based on thermally assisted spin tunneling induced by quartic anisotropy and weak transverse magnetic fields. The overall relaxation rate as a function of the magnetic field is calculated and shown to agree well with data including all resonance peaks. The Lorentzian shape of the resonances is also in good agreement with recent data. A generalized master equation including resonances is derived and solved exactly. It is shown that many transition paths with comparable weight exist that contribute to the relaxation process. Previously unknown spin-phonon coupling constants are calculated explicitly.

Original language	English
Pages (from-to)	692-698
Number of pages	7
Journal	Europhysics Letters
Volume	46
Issue number	5
DOIs	https://doi.org/10.1209/epl/i1999-00321-x
State	Published - 1 Jun 1999
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1209/epl/i1999-00321-x

Cite this

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title = "Spin relaxation in Mn12-acetate",

abstract = "We present a comprehensive theory of the magnetization relaxation in a Mn12-acetate crystal based on thermally assisted spin tunneling induced by quartic anisotropy and weak transverse magnetic fields. The overall relaxation rate as a function of the magnetic field is calculated and shown to agree well with data including all resonance peaks. The Lorentzian shape of the resonances is also in good agreement with recent data. A generalized master equation including resonances is derived and solved exactly. It is shown that many transition paths with comparable weight exist that contribute to the relaxation process. Previously unknown spin-phonon coupling constants are calculated explicitly.",

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T1 - Spin relaxation in Mn12-acetate

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AU - Loss, D.

PY - 1999/6/1

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N2 - We present a comprehensive theory of the magnetization relaxation in a Mn12-acetate crystal based on thermally assisted spin tunneling induced by quartic anisotropy and weak transverse magnetic fields. The overall relaxation rate as a function of the magnetic field is calculated and shown to agree well with data including all resonance peaks. The Lorentzian shape of the resonances is also in good agreement with recent data. A generalized master equation including resonances is derived and solved exactly. It is shown that many transition paths with comparable weight exist that contribute to the relaxation process. Previously unknown spin-phonon coupling constants are calculated explicitly.

AB - We present a comprehensive theory of the magnetization relaxation in a Mn12-acetate crystal based on thermally assisted spin tunneling induced by quartic anisotropy and weak transverse magnetic fields. The overall relaxation rate as a function of the magnetic field is calculated and shown to agree well with data including all resonance peaks. The Lorentzian shape of the resonances is also in good agreement with recent data. A generalized master equation including resonances is derived and solved exactly. It is shown that many transition paths with comparable weight exist that contribute to the relaxation process. Previously unknown spin-phonon coupling constants are calculated explicitly.

UR - https://www.scopus.com/pages/publications/0033137422

U2 - 10.1209/epl/i1999-00321-x

DO - 10.1209/epl/i1999-00321-x

M3 - Article

AN - SCOPUS:0033137422

SN - 0295-5075

VL - 46

SP - 692

EP - 698

JO - Europhysics Letters

JF - Europhysics Letters

IS - 5