Structural characterization of MnNi and MnPt antiferromagnetic materials for spintronic applications

resumo

MnNi and MnPt become antiferromagnetic (AFM) when annealed at high enough temperatures, for which a face-centered cubic (fcc) to face-centered tetragonal (fcc) structural transition occurs. Thus, structural information is essential when optimizing exchange bias in these materials. We performed structural (Xray diffraction), magnetic (Magneto-Optical Kerr effect) and magneto-transport (magnetoresi stance) measurements on MnNi based spin valves subjected to different annealing procedures and MnPt/CoFe bilayers with different MnPt thicknesses. We show that high annealing temperatures can in fact lead to the fct anti ferromagnetic phase in both materials, but the annealing procedure is also an important factor on the obtained exchange field values. Also, MnPt/CoFe bilayers allowed us to probe the influence of average AFM-grain size on exchange bias. (c) 2008 Elsevier B.V. All rights reserved.

palavras-chave

EXCHANGE BIAS; SPIN VALVES; TUNNEL-JUNCTIONS; MAGNETORESISTANCE; BILAYERS; SYSTEMS; FIELD; MOKE

categoria

Materials Science

autores

Teixeira, JM; Ventura, J; Araujo, JP; Sousa, JB; Amaral, VS; Negulescu, B; Rickart, M; Freitas, PP

nossos autores

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".