Repositório Digital

A- A A+

Negative rotatable anisotropy in IrMn/Cr/Co thin films

.

Negative rotatable anisotropy in IrMn/Cr/Co thin films

Mostrar registro completo

Estatísticas

Título Negative rotatable anisotropy in IrMn/Cr/Co thin films
Autor Nicolodi, Sabrina
Pereira, Luis Gustavo
Oliveira, Artur Harres de
Azevedo, Gustavo de Medeiros
Schmidt, Joao Edgar
García Aguilar, I.
Souza Neto, N. M.
Deranlot, Cyrile
Petroff, Frédéric
Geshev, Julian Penkov
Abstract This work presents modifications of the magnetic properties of polycrystalline IrMn/Cr(tCr)/Co films where the Cr spacer thickness tCr was varied between 0.25 and 3 nm. High-resolution transmission electron microscopy, x-ray diffractometry and reflectivity, as well as x-ray absorption near-edge structure were used for the structural characterization of the films; static magnetization curves as well as ferromagnetic resonance measurements were employed for the magnetic characterization. Decrease of the exchange-bias field and considerable and nonmonotonous enhancement of the coercivity with tCr were observed. The films’ anisotropy parameters were extracted from the experimental angular variations of the resonance field and from the hard-axis magnetization curves via numerical simulations. It was obtained that the two phenomena studied, namely, the exchange bias and rotatable anisotropy, have different origins. The rotatable anisotropy was ascribed to Cr interface coupled antiferromagnetically with the Co atoms. On the other hand, the occurrence of exchange bias, even for the film with the thickest Cr layer, was attributed to uncompensated spins at the topmost IrMn interface. Together with the significant increase with tCr of the rotatable anisotropy field, near saturation it is antiparallel to the external magnetic field.
Contido em Physical review. B, Condensed matter and materials physics. Vol. 85, no. 22 (June 2012), 224438, 6 p.
Assunto Anisotropia magnetica
Filmes finos
Propriedades magneticas
Transições magnéticas
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104532
Arquivos Descrição Formato
000852436.pdf (936.8Kb) Texto completo (inglês) Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.