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Title: Emergence of noncollinear anisotropies from interfacial magnetic frustration in exchange-bias systems.

Abstract

Exchange bias, referred to the interaction between a ferromagnet (FM) and an antiferromagnet (AFM), is a fundamental interfacial magnetic phenomenon, which is key to current and future applications. The effect was discovered half a century ago, and it is well established that the spin structures at the FM/AFM interface play an essential role. However, currently, ad hoc phenomenological anisotropies are often postulated without microscopic justification or sufficient experimental evidence to address magnetization-reversal behavior in exchange-bias systems. We advance toward a detailed microscopic understanding of the magnetic anisotropies in exchange-bias FM/AFM systems by showing that symmetry-breaking anisotropies leave a distinct fingerprint in the asymmetry of the magnetization reversal and we demonstrate how these emerging anisotropies are correlated with the intrinsic anisotropy. Angular and vectorial resolved Kerr hysteresis loops from FM/AFM bilayers with varying degree of ferromagnetic anisotropy reveal a noncollinear anisotropy, which becomes important for ferromagnets with vanishing intrinsic anisotropy. Numerical simulations show that this anisotropy naturally arises from the inevitable spin frustration at an atomically rough FM/AFM interface. As a consequence, we show in detail how the differences observed for different materials during magnetization reversal can be understood in general terms as originating from the interplay between interfacial frustration andmore » intrinsic anisotropies. This understanding will certainly open additional avenues to tailor future advanced magnetic materials.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Spanish Ministry of Education and Science; MEC; Communida de Madrid
OSTI Identifier:
966347
Report Number(s):
ANL/MSD/JA-65423
Journal ID: ISSN 1098-0121; TRN: US200921%%273
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B
Additional Journal Information:
Journal Volume: 80; Journal Issue: 2009; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ANISOTROPY; ASYMMETRY; HYSTERESIS; MAGNETIC MATERIALS; MAGNETIZATION; SPIN; FERROMAGNETISM; ANTIFERROMAGNETISM; INTERFACES; COMPUTERIZED SIMULATION

Citation Formats

Jimenez, E, Camarero, J, Sort, J, Nogues, J, Mikuszeit, N, Garcia-Martin, J M, Hoffmann, A, Dieny, B, Miranda, R, Univ. Autonoma de Madrid, Univ. Autonoma de Barcelona, Inst. de Microelectronica de Madrid, and SPINTEC,. Emergence of noncollinear anisotropies from interfacial magnetic frustration in exchange-bias systems.. United States: N. p., 2009. Web. doi:10.1103/PhysRevB.80.014415.
Jimenez, E, Camarero, J, Sort, J, Nogues, J, Mikuszeit, N, Garcia-Martin, J M, Hoffmann, A, Dieny, B, Miranda, R, Univ. Autonoma de Madrid, Univ. Autonoma de Barcelona, Inst. de Microelectronica de Madrid, & SPINTEC,. Emergence of noncollinear anisotropies from interfacial magnetic frustration in exchange-bias systems.. United States. https://doi.org/10.1103/PhysRevB.80.014415
Jimenez, E, Camarero, J, Sort, J, Nogues, J, Mikuszeit, N, Garcia-Martin, J M, Hoffmann, A, Dieny, B, Miranda, R, Univ. Autonoma de Madrid, Univ. Autonoma de Barcelona, Inst. de Microelectronica de Madrid, and SPINTEC,. Thu . "Emergence of noncollinear anisotropies from interfacial magnetic frustration in exchange-bias systems.". United States. https://doi.org/10.1103/PhysRevB.80.014415.
@article{osti_966347,
title = {Emergence of noncollinear anisotropies from interfacial magnetic frustration in exchange-bias systems.},
author = {Jimenez, E and Camarero, J and Sort, J and Nogues, J and Mikuszeit, N and Garcia-Martin, J M and Hoffmann, A and Dieny, B and Miranda, R and Univ. Autonoma de Madrid and Univ. Autonoma de Barcelona and Inst. de Microelectronica de Madrid and SPINTEC,},
abstractNote = {Exchange bias, referred to the interaction between a ferromagnet (FM) and an antiferromagnet (AFM), is a fundamental interfacial magnetic phenomenon, which is key to current and future applications. The effect was discovered half a century ago, and it is well established that the spin structures at the FM/AFM interface play an essential role. However, currently, ad hoc phenomenological anisotropies are often postulated without microscopic justification or sufficient experimental evidence to address magnetization-reversal behavior in exchange-bias systems. We advance toward a detailed microscopic understanding of the magnetic anisotropies in exchange-bias FM/AFM systems by showing that symmetry-breaking anisotropies leave a distinct fingerprint in the asymmetry of the magnetization reversal and we demonstrate how these emerging anisotropies are correlated with the intrinsic anisotropy. Angular and vectorial resolved Kerr hysteresis loops from FM/AFM bilayers with varying degree of ferromagnetic anisotropy reveal a noncollinear anisotropy, which becomes important for ferromagnets with vanishing intrinsic anisotropy. Numerical simulations show that this anisotropy naturally arises from the inevitable spin frustration at an atomically rough FM/AFM interface. As a consequence, we show in detail how the differences observed for different materials during magnetization reversal can be understood in general terms as originating from the interplay between interfacial frustration and intrinsic anisotropies. This understanding will certainly open additional avenues to tailor future advanced magnetic materials.},
doi = {10.1103/PhysRevB.80.014415},
url = {https://www.osti.gov/biblio/966347}, journal = {Phys. Rev. B},
issn = {1098-0121},
number = 2009,
volume = 80,
place = {United States},
year = {2009},
month = {1}
}