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Peculiar Magnetic Properties of the Half-metallic Co_2CrAl Heusler Alloy
김기원,이주열,이영백,Yury V. Kudryavtsev,Valery G. Prokhorov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.5
A giant negative magnetization in the Co_2CrAl compounds, inboth bulk and thin film, below a certain temperature (T_z) wasobserved. Above T_z, the compound behaves as an ordinaryferromagnet. The negative magnetic alignment might be initiated bythe Landau diamagnetism because of the half-metallic propertiesand the pinning of the negative magnetization is preserved by thepeculiar electronic structures.
Electronic Structures and Magnetic Properties of Co2CrAl Films
김기원,이영백,현영훈,박상윤,이주열,Yury V. Kudryavtsev,V. A. Oksenenko,Janusz Dubowik 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
In this study, Co2CrAl Heusler alloy (HA) films with significantly different structural orders were fabricated and the in fluence of atomic disorder on various physical properties was investigated. We found that the lattice constant of the films gradually increased as the structural disorder increased. We also showed that the ordered Co2CrAl HA films were ferromagnetically ordered with a Curie temperature close to that of the bulk sample. The structural disorder causes a reduction in the saturation magnetization and the decrease in the Curie temperature. As the structural order was increased, the main peak of the Co L3-edge spectrum shifted to a higher energy. The observed experimental results were analyzed in connection with changes in the atomic and the electronic structures.