Multiple conical spin order in spinel structure stabilized by magnetic anisotropy
Conical spin order, where the spin components along the conical axis form magnetization while the spiral parts induce ferroelectric polarization, possesses multiferroicity with inherent magnetoelectric coupling. A Monte Carlo simulation performed using a classical Heisenberg spinel (AB2O4) model reveals a multiple conical spin order, i.e., three modulations with different cone angles and wavelengths on A sites and two alternate B sites. The spin order not only exists as the ground state but also survives locally stably in a larger parameter region. The whole existence range can be effectively expanded by anisotropy to cover the cases of CoCr2O4 and MnCr2O4. The multiple conical spin order is well maintained and finely tuned by frustration and anisotropy over the whole existence range, and the magnetic and ferroelectric properties are influenced correspondingly.
Keywordsconical spin order multiferroicity spinel structure Monte Carlo simulation
This work was supported by the research grants from the Natural Science Foundation of Jiangsu Province of China (Grant Nos. BK20141329 and 15KJB140009).
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