Spin filtering through ferromagnetic BiMnO3 tunnel barriers -: art. no. 020406
Spin filtering through ferromagnetic BiMnO3 tunnel barriers -: art. no. 020406
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DOI：
10.1103/physrevb.72.020406
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发表时间：
2005-07-01
影响因子：
3.7
通讯作者：
Fert, A
中科院分区：
文献类型：
--
作者：
Gajek, M;Bibes, M;Fert, A
我们报告的实验自旋过滤通过绝缘和铁磁氧化物BiMnO 3（BMO）的单晶层。用半金属氧化物La_（2/3）Sr_（1/3）MnO_3（LSMO）反电极研究了电子从金电极隧穿BMO的自旋极化。在3 K时，我们发现隧道电阻随BMO和LSMO的磁化方向是平行还是相反而变化50%。这种效应对应于高达22%的自旋过滤效率。因此，我们的研究结果表明，复杂的铁磁绝缘氧化物的自旋过滤和注入的潜力。
We report on experiments of spin filtering through ultrathin single-crystal layers of the insulating and ferromagnetic oxide BiMnO3 (BMO). The spin polarization of the electrons tunneling from a gold electrode through BMO is analyzed with a counterelectrode of the half-metallic oxide La2/3Sr1/3MnO3 (LSMO). At 3 K we find a 50% change of the tunnel resistances according to whether the magnetizations of BMO and LSMO are parallel or opposite. This effect corresponds to a spin-filtering efficiency of up to 22%. Our results thus show the potential of complex ferromagnetic insulating oxides for spin filtering and injection.