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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.
Structural Dependence of the Physical Properties for Co2MnGa Heusler Alloy Films
R. J. Kim,이영백,이주열,K. K. Yu,K. W. Kim,남창우,V. A. Oksenenko,Y. J. Yoo,Y. V. Kudryavtsev 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
In this study, Co2MnGa Heusler alloy (HA) ¯lms with signi¯cantly dierent structural orders were fabricated, and the in°uence of structural ordering on various physical properties was investigated. Co2MnGa ¯lms were deposited by °ash evaporation onto glass substrates at various substrate temperatures from 150 to 753 K. A disordered state of the ¯lms was achieved by using a vapor-quenching deposition at 150 K. Deposition at 623 K or post annealing of the disordered ¯lm at 728 K resulted in the formation of an intermediate structural order. As the substrate or the post-annealing temperature was decreased, a slight increase in the lattice constants was observed. We also found that the grain size increased in the ¯lms deposited at higher substrate temperatures. The ordered and intermediately ordered ¯lms exhibit ferromagnetic behavior and similar equatorial Kerr eect (EKE) spectra. Similar to the previously studied Ni-based HA ¯lms, the disordered ¯lm is nonmagnetic and has little EKE response. An annealing of the disordered ¯lm restores its crystalline structure and recovers the ferromagnetic order.