科研之友
微信
新浪微博
Facebook
分享链接
摘要
Chromium(III) oxide is a collinear antiferromagnet with a linear magnetoelectric effect. We are presenting the measurements of the magnetoelectric susceptibility a of a sputter-deposited 500 nm film and a bulk single-crystal substrate of Cr2O3. We investigated the magnetic phasetransition and the critical exponent beta of the sublattice magnetization near Neel temperature. For the film, an exponent of 0.49(1) was found below 293 K, and changed to 1.06(4) near the Neel temperature of 298 K. For the bulk substrate, the exponent was constant at 0.324(4). We investigated the reversal probability of antiferromagnetic domains during magnetoelectric field cooling. For the sputtered films, reversal probability was zero above 298 K and stabilized only below 293 K. We attribute this behaviour to formation of grains during film growth, which gives different intergrain and intragrain exchange-coupling energies. The reversal probability dependence on the magnitude of cooling magnetic field could be explained by a phenomenological model. For the bulk substrate, reversal probability was stabilized immediately at the Neel temperature of 307.6 K.
- 出版日期2017-4-20
