https://doi.org/10.1140/epjst/e2008-00667-1
Effects of Fe and Co addition on the magnetoresistance in Ni-Mn-Ga films
1
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: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
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
