1 Faculty of Science and Technology, Hirosaki Univ., Hirosaki 036-8561, Japan
2 Graduate School of Engineering, Tohoku Univ., Sendai 980-8579, Japan
3 Dept. Materials Sciences, Saitama University, Saitama 338-8570, Japan
| GMR and soft magnetic properties were investigated in nano-scale inhomogeneous Ni1-xMnx alloys (x = 0.20～0.30), where ordered single-domain particles are distributed in disordered nonmagnetic or Ni-rich or Mn-rich matrices. The GMR of Ni3Mn alloy depends on the volume fraction of ordered domains ε. Maximum value of -1.8% is obtained at ε ～ 0.2. Moreover, the GMR depends remarkably on x: GMR for 0.20≤x≤ 0.24 is small (Type I) and for 0.26≤ x ≤ 0.30 has a maximum of －6% at x = 0.30 (Type II). Types I and II are caused respectively by ferromagnetic and antiferromagnetic interactions between domains. |
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