Successive Magnetic-Field-Induced Transitions and Colossal Magnetoelectric Effect in Ni3TeO6
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- Successive Magnetic-Field-Induced Transitions and Colossal Magnetoelectric Effect in Ni3TeO6
- Kim, Jae Wook; Artyukhin, S; Mun, ED; Jaime, M; Harrison, N; Hansen, A; Yang, JJ; Oh, Yoon Seok; Vanderbilt, D; Zapf, VS; Cheong, SW
- Digital storage; Magnetoelectric effects; Polarization
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.115, no.13, pp.137201 -
- We report the discovery of a metamagnetic phase transition in a polar antiferromagnet Ni3TeO6 that occurs at 52 T. The new phase transition accompanies a colossal magnetoelectric effect, with a magnetic-field-induced polarization change of 0.3 μC/cm2, a value that is 4 times larger than for the spin-flop transition at 9 T in the same material, and also comparable to the largest magnetically induced polarization changes observed to date. Via density-functional calculations we construct a full microscopic model that describes the data. We model the spin structures in all fields and clarify the physics behind the 52 T transition. The high-field transition involves a competition between multiple different exchange interactions which drives the polarization change through the exchange-striction mechanism. The resultant spin structure is rather counterintuitive and complex, thus providing new insights on design principles for materials with strong magnetoelectric coupling.
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