Spin-Induced Multiferroic Behavior in Centrosymmetric Mn₃WO₆

Abstract

The Mn 3 WO 6 oxide, prepared by a solid-state reaction at ambient pressure, is found to crystallize at room temperature in the centrosymmetric R3̅ trigonal structure of Mg 3 TeO 6 . By X-ray absorption spectroscopy (XAS) at the Mn-L 2,3 edges, a divalent oxidation state for manganese is established, consistent with W 6+ and O 2− , which fits with the value extracted from analyzing the paramagnetic regime. Interestingly, anomalies in dielectric and pyroelectric measurements can be observed concomitant with the antiferromagnetic transition at T N ≈ 25 K. The corresponding electrical polarization, P = ±15 μC m −2 below T N , can be inverted by opposite poling, which confirms that Mn 3 WO 6 is a spin-induced multiferroic (MF) material.

High-pressure single crystal growth and magnetoelectric properties of CdMn7O12

“…ferroelectric random access memories [9][10][11][12][13]. Nevertheless, on account of the mutual exclusion between magnetization and ferroelectricity [6,14], the amount of single-phase multiferroics has been limited up to now [15][16][17][18][19][20].…”

“…Although the AFM1 magnetic structure of CdMn 7 O 12 possesses a polar magnetic point group of 1, the expected spin-driven ferroelectric polarization is not detectable in polycrystalline sample. Since single crystal can sharply enhance the magnitude of electric polarization as exampled by the isostructural CaMn 7 O 12 [25,26] and other multiferroics [20,36], the single crystalline specimen of CdMn 7 O 12 is thus requisite to inquire the ferroelectric properties and the ME effects.…”