2002 Volume 43 Issue 9 Pages 2181-2184
We investigated the magnetic properties of Ni1−xMnx (x=0.20–0.30) alloys with dispersed nanoparticles having a ferromagnetic Ni3Mn ordered phase, which is caused by suitable heat treatment. Magnetic analysis shows that for 0.3≥x>0.25 alloys interaction between 4–10 nm particles through Mn-rich matrix is antiferromagnetic. The Néel temperature increases with both Mn concentration and long-range-order parameter. On the contrary, for 0.25>x≥0.20 alloys, interaction between ∼ 4 nm particles through Ni-rich matrix is ferromagnetic. These alloys exhibit soft magnetic properties and have permeability of 400–600 for 1–500 kHz high frequency.