Exploiting interfacial and size effects to construct oxide superlattices with robust and tunable magnetoelectric properties at room temperature

04/02/2015

Auteurs

Y. Yang, L. Bellaiche, and J. Íñiguez

Référence

Physical Review B, vol. 91, no. 7, p. 075423, 2015

Description

We propose a strategy to create materials displaying robust and tunable magnetoelectric multiferroic properties at room temperature. The key idea is to construct heterostructures that combine two different constituents: (1) compound BiFeO3, which presents strong ferroelectric and antiferromagnetic orders well above room temperature, but displays a small magnetic moment, and (2) a ferromagnetic insulator (e.g., BiMnO3) that is only required to couple magnetically with BiFeO3. Our simulations show that it is possible to combine such materials to create superlattices that present (i) a room-temperature multiferroic state with relatively large magnetization (up to 0.3μB per transition metal atom, with the possibility to improve by finding a suitable replacement for BiMnO3), (ii) an amply customizable magnetic behavior, and (iii) a strong magnetoelectric coupling. Thus, the design strategy successfully addresses a great challenge in the area of magnetoelectric multiferroics, exploiting interfacial couplings and size (layer-thickness) effects to produce materials apt for applications.

Lien

doi:10.1103/PhysRevB.91.075423

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