Effects of Fe and Co addition on the magnetoresistance in Ni-Mn-Ga films
Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan
2 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
3 Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
4 New Industry Creation Hatchery Center, Tohoku University, Aoba-yama 6-6-10, Aoba-ku, Sendai, Miyagi, 980-8579, Japan
Corresponding author: email@example.com
Effects of Fe and Co addition on the magnetoresistance MR were investigated in sputtered Ni-Mn-Ga-M (M = Fe, Co) films. With increasing M content, magnetization σ enhanced for M = Fe, while it reduced for M = Co. At 300 K, absolute MR value at 1.5 T |MR|1.5 was about 1%. The value of |MR|1.5 was found to be decreased with increasing M = Fe content. In the case of M = Co, |MR|1.5 increased with M content. |MR|1.5 of the film containing Co 1.6 at.% showed a maximum value of 2.5% at 355 K in the vicinity of the Curie temperature TC. An origin of MR behavior in the present films was suggested to be explained by a s-d scattering model.
© EDP Sciences, Springer-Verlag, 2008