Thermally induced magnetization reversal in submicron Ni particles formed on single crystalline lithium triborate

The influence of the thermally induced magnetoelastic effect on the magnetization reversal field in 0.9$\times$0.3$\times$0.03-$\mu$m Ni particles formed on a single crystalline lithium triborate (LiB$_3$O$_5$) substrate has been studied. It has been shown experimentally that this substrate can reduce the magnetization reversal field of particles by a factor of more than 1.5 as the temperature of the sample increases from 30 to 45$^\circ$C. This reduction of the reversal field is due to magnetoelastic anisotropy induced in the particles by the difference between the thermal expansion coefficients of the substrate along different crystallographic axes.