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Thickness effect on the easy axis distribution in exchange biased Co/IrMn bilayers

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dc.contributor.author Tarazona H.S. es_PE
dc.contributor.author Tafur M. es_PE
dc.contributor.author Quispe-Marcatoma J. es_PE
dc.contributor.author Landauro C.V. es_PE
dc.contributor.author Baggio-Saitovitch E. es_PE
dc.contributor.author Schmool D.S. es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2019
dc.description This work has been partially supported by the Brazilian agencies CNPq and FAPERJ. H. S. T. thanks to the Peruvian Doctoral Scholarship Program of CIENCIACTIVA (CONCYTEC) for financial support under Grand #218-2014-FONDECYT. J. Q-M and C. V. L. are grateful to CIENCIACTIVA (CONCYTEC) for partial financial support through the Excellence Center Programs. J. Q-M is also grateful to the GEMaC Laboratory, for the hospitality during the preparation of this manuscript. In addition, E. B. S. acknowledges support from FAPERJ through several grants including Emeritus Professor fellow and CNPq for BPA and corresponding grants.
dc.description.abstract It is commonly assumed that in uncompensated FM/AF interfaces, the easy axes of antiferromagnetic grains are aligned toward the magnetic field direction applied during the film growth. However, due to several intrinsic and extrinsic factors, these easy axes can be aligned away from the unidirectional axis. In this context, the aim of this work is to study the relationship between the easy axes distribution (EAD) and thickness of both the ferromagnetic (FM) and antiferromagnetic (AF) layers in Co/IrMn bilayer systems. A phenomenological model for the free energy of the system that takes into account a domain wall formation in the AF layer and a Gaussian-type distribution of their easy axes is used. Thus, we simulate and fit the magnetization curves and get several magnetic parameters like rotatable anisotropy field, exchange bias field, coercivity and magnetic anisotropy. Our results show that when the AF thickness is increased, the width of the easy-axis distribution also increases following a power-law relationship. However, no correlation is observed when the FM thickness is varied. Furthermore, considering an easy-axis distribution we observe a significant reduction in coercivity as well as a slight decrease of the exchange bias field.
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.doi https://doi.org/10.1016/j.physb.2019.05.005
dc.identifier.scopus 2-s2.0-85065698888
dc.identifier.uri https://hdl.handle.net/20.500.12390/806
dc.language.iso eng
dc.publisher Elsevier B.V.
dc.relation.ispartof Physica B: Condensed Matter
dc.rights info:eu-repo/semantics/openAccess
dc.subject Rotatable anisotropy
dc.subject Antiferromagnetism es_PE
dc.subject Coercive force es_PE
dc.subject Domain walls es_PE
dc.subject Film growth es_PE
dc.subject Free energy es_PE
dc.subject Frequency modulation es_PE
dc.subject Antiferromagnetic grains es_PE
dc.subject Domain wall formation es_PE
dc.subject Easy axis es_PE
dc.subject Exchange bias es_PE
dc.subject Magnetic field direction es_PE
dc.subject Phenomenological modeling es_PE
dc.subject Power law relationship es_PE
dc.subject Magnetic anisotropy es_PE
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.03.00
dc.title Thickness effect on the easy axis distribution in exchange biased Co/IrMn bilayers
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
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