Magnetic properties of Ni-Mn alloys with dispersed ferromagnetic nanoparticles

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 greater than or equal to x > 0.25 alloys interaction between 4-10 nm particles through Mn-rich matrix is antiferromagnetic. The Neel temperature increases with both Mn concentration and long-range-order parameter. On the contrary, for 0.25 > x greater than or equal to 0.20 alloys, interaction between similar to4 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.