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Type: Artigo de periódico
Title: Macroscopic quantum tunneling of magnetization explored by quantum-first-order reversal curves
Author: Beron, F
Novak, MA
Vaz, MGF
Guedes, GP
Knobel, M
Caldeira, A
Pirota, KR
Abstract: A method to study the fundamental problem of quantum double well potential systems that display magnetic hysteresis is proposed. The method, coined quantum-first-order reversal curve (QFORC), is inspired by the first-order reversal curve, based on the Preisach model for hysteresis. We successfully tested the QFORC method in the hysteresis of the Mn12Ac molecular magnet, which is governed by macroscopic quantum tunneling of magnetization. The QFORC reproduces well the experimental magnetization behavior. It is possible to separate the thermal activation and tunneling contributions from the magnetization variation, as well as associate the magnetization jumps with specific quantum transitions. (C) 2013 AIP Publishing LLC.
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.4816131
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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