Exchange coupling and NOL magnetism consideration in Co1−xFex specular spin-valves

• Published in: Journal of magnetism and magnetic materials Vol. 287; pp. 381 - 386
• Main Authors: Doi, M., Izumi, M., Abe, Y., Fukuzawa, H., Fuke, H.N., Iwasaki, H., Sahashi, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2005; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Exchange coupling; Giant magnetoresistance; Magnetic properties and materials; Magnetotransport phenomena, materials for magnetotransport; Nano-oxide layer; Physics; Specular spin valve; Studies of specific magnetic materials; Nano-oxide layer; Specular spin valve; 81.16.Pr; Exchange coupling; 75.47.De; Spin valve; Cooling; Magnetization; Oxide layer; Roughness; Iron; Giant magnetoresistance; Ferrimagnetic materials; 81.16.Pr Specular spin valve; Temperature effects; Magnetism; Oxidation; Exchange interactions
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2004.10.063

To confirm the origin of the exchange coupling through the nano-oxide layer (NOL), the detailed analyses of the magnetization curve and the temperature dependence on magnetization for the Co1−xFex-NOL samples with various oxidation processes are investigated. The field cooling effect is observed for NOL-inserted samples, which suggests the existence of the antiferromagnetic (AFM) component in the NOL. The characteristic temperature (blocking temperature) increases with increase in the Fe content for Co1−xFex(x=0.08,0.17,0.26)-NOL. These results support that NOL pinning appears higher than room temperature. Further, the twisted coupling through the NOL observed for the Co0.50Fe0.50-NOL is discussed from the viewpoint of the magnetic roughness due to the ferrimagnetic nature of the very thin NOL in specular spin valve (SPSV).