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No.2(pp.37-80)

Home > Issues > Volume 13 (2008) > No.2(pp.37-80)

Antiferromagnetically Exchange-coupled Two Phase Magnets: Co/Co₂TiSn

Journal of Magnetics, Volume 13, Number 2, 30 Jun 2008, Pages 43-52

Tae-Wan Kim*

(Department of Advanced Materials Engineering, Sejong University), Jung-Keun Oh(College of Architecture, Konkuk University)

Abstract

The objective of this paper is to review the magnetic and magneto-transport properties of Co/Co₂TiSn consisting of two metallic magnetic phases that are antiferromagnetically exchange-coupled at the phase boundary. The bulk Co/Co₂TiSn system, which has a TiSn Heusler alloy precipitates in the hexagonal Co matrix, showed an unusual coercivity change with a Co₂concurrent change in temperature, and was modeled on the basis of a wall formation caused by exchange coupling at the phase boundary. For measurements of magneto-transport properties, Co/Co₂TiSn thin films that had two-magnet phases were deposited using a magnetron sputtering system with a composite target. The magnetization process in the films is also explained on the basis of the model of wall formation at the phase boundary. Annealed Co/Co₂TiSn films showed a 0.12% GMR effect, indicating the scattering of polarized conduction electrons due to the antiparallel exchange coupling at the phase boundary. The scattering process of conduction electrons at the phase boundary was modeled with relation to the magnetization process.

Keywords: two phase magnet; antiparallel exchange; wall formation giant magnetoresistance

DOI: 10.4283/JMAG.2008.13.2.43

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