Magnetic Anisotropy Reversal Research Articles

Investigation of the magnetic properties in double perovskite R2CoMnO6 single crystals (R = rare earth: La to Lu)

We have successfully synthesized the series of the double-perovskite R2CoMnO6 (R = rare earth: La to Lu) single crystals and have investigated their magnetic properties. The ferromagnetic order of Co2+/Mn4+ spins emerges mainly along the c axis. Upon decreasing the size of rare earth ion, the magnetic transition temperature decreases linearly from 204 K for La2CoMnO6 to 48 K for Lu2CoMnO6, along with the enhancement of monoclinic distortion. The temperature and magnetic-field dependences of magnetization reveal the various magnetic characteristics such as the metamagnetic transition in R = Eu, the isotropic nature of rare earth moment in R = Gd, and the reversal of magnetic anisotropy in R = Tb and Dy. Our results offer comprehensive information for understanding the roles of mixed-valent magnetic ions and rare earth magnetic moments on the magnetic properties.

Magnetic anisotropy reversal by shear stress in (110)-orientated La2/3Ca1/3MnO3 films

In-plane magnetic anisotropy has been studied for the (110)-orientated La2/3Ca1/3MnO3 (LCMO) films grown on SrTiO3 (STO) and LaAlO3 (LAO) substrates. Deviation from orthorhombic symmetry is observed in these two series of films, particularly for the films grown above LAO, which suffer from a strong shear strain. A switch of the magnetic easy axis between the [001] and [1-10] axes is observed for the LCMO/LAO films as structure deformation varies, while the LCMO/STO films exhibit a [001] easy axis. An analytical analysis of the influence of magnetoelastic energy on magnetic anisotropy is performed, and the dominative role of shear strain is revealed. The present work indicates that the lattice distortion provides a feasible approach towards magnetic engineering, leading to abundant magnetic phenomena.