Korenev V L, Kalitukha I V, Akimov I A, Sapega V F, Zhukov E A, Kirstein E, Ken O S, Kudlacik D, Karczewski G, Wiater M, Wojtowicz T, Ilyinskaya N D, Lebedeva N M, Komissarova T A, Kusrayev Yu G, Yakovlev D R, Bayer M
Ioffe Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia.
Experimentelle Physik 2, Technische Universität Dortmund, D-44227, Dortmund, Germany.
Nat Commun. 2019 Jul 1;10(1):2899. doi: 10.1038/s41467-019-10774-0.
Voltage control of ferromagnetism on the nanometer scale is highly appealing for the development of novel electronic devices with low power consumption, high operation speed, reliable reversibility and compatibility with semiconductor technology. Hybrid structures based on the assembly of ferromagnetic and semiconducting building blocks are expected to show magnetic order as a ferromagnet and to be electrically tunable as a semiconductor. Here, we demonstrate the electrical control of the exchange coupling in a hybrid consisting of a ferromagnetic Co layer and a semiconductor CdTe quantum well, separated by a thin non-magnetic (Cd,Mg)Te barrier. The electric field controls the phononic ac Stark effect-the indirect exchange mechanism that is mediated by elliptically polarized phonons emitted from the ferromagnet. The effective magnetic field of the exchange interaction reaches up to 2.5 Tesla and can be turned on and off by application of 1V bias across the heterostructure.
纳米尺度上铁磁性的电压控制对于开发低功耗、高运行速度、可靠可逆性且与半导体技术兼容的新型电子器件极具吸引力。基于铁磁和半导体构建块组装的混合结构有望表现出铁磁体的磁有序性，并具有半导体的电可调性。在此，我们展示了在由铁磁Co层和半导体CdTe量子阱组成的混合结构中，通过薄的非磁性（Cd,Mg）Te势垒隔开，对交换耦合进行的电控制。电场控制声子交流斯塔克效应——由铁磁体发射的椭圆偏振声子介导的间接交换机制。交换相互作用的有效磁场高达2.5特斯拉，通过在异质结构上施加1V偏压可实现开启和关闭。
