期刊
PHYSICAL REVIEW B
卷 79, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.140403
关键词
chromium compounds; ferromagnetic materials; magnetisation; magnetoelectric effects; surface magnetism
资金
- NSF of China [50771072, 50832003]
- Shanghai Pujiang and ShuGuang Program, Shanghai Leading Academic Discipline Project [B411]
- Nebraska Research Initiative, the Nanoelectronics Research Initiative of Semiconductor Research Corporation
- Materials Research Science and Engineering Center at the University of Nebraska [DMR-0820521]
An electric field applied to a ferromagnetic metal produces a surface magnetoelectric effect originating from the spin-dependent screening of the electric field which results in a change in the surface magnetization of the ferromagnet. Here we predict that if the ferromagnet is a half-metal, due to the screening charge formed solely by single-spin conducting states, the surface magnetoelectric coefficient is the universal constant mu(B)/ec(2)approximate to 6.44x10(-14) G cm(2)/V. This prediction is in excellent agreement with results of our first-principles calculations of the magnetic response of a half-metallic CrO2 to an applied electric field. The universal value of the surface magnetoelectric coefficient in half-metals may be used as another tool for detecting half-metallicity.
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