Depth-dependent ferromagnetic spin structure and asymmetric magnetization reversal in exchange-biased Fe/FeMn bilayers
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Universidade Federal de Minas Gerais
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Depth-dependent spin rotation of the Fe spins upon magnetisation reversal of the ferromagnetic layer in poly-
crystalline Fe/FeMn exchange-biased bilayers was investigated by using Fe probe layers and angular hysteresis
loops constructed from in-field Fe conversion electron Mössbauer spectroscopy (CEMS) measurements and
magnetometry. Our results provide evidence for the formation of an exchange-spring-like domain wall structure
inside the ferromagnetic Fe layer during magnetisation reversal along the forward branch of the hysteresis loop
(H values varying from positive to negative), and coherent reversal along the recoil branch (H varying from
negative to positive). This result implies asymmetric magnetisation reversal for each branch of the hysteresis
loop, as indicated by depth-resolved CEMS and vibrating sample magnetometry. These results are relevant for
the development of more precise quantitative models for exchange bias in polycrystalline metallic systems with
Mn-based antiferromagnets such as those used in spintronic applications.
Abstract
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Magnetismo, Espectroscopia de Mossbauer
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Exchange bias, Fe/FeMn bilayers, Magnetization reversal, Spin structure, Depth-dependent in-field conversion electron, Mössbauer spectroscopy
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https://www.sciencedirect.com/science/article/pii/S0304885319339861