Ferromagnetism in transparent thin films of MgO
Ferromagnetism in transparent thin films of MgO
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DOI：
10.1103/physrevb.82.024405
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发表时间：
2010-07
影响因子：
3.7
通讯作者：
C. Martínez-Boubeta;J. Beltran;L. Balcells;Z. Konstantinović;S. Valencia;D. Schmitz;J. Arbiol;S. Estradé;J. Cornil;B. Martínez
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文献类型：
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作者：
C. Martínez-Boubeta;J. Beltran;L. Balcells;Z. Konstantinović;S. Valencia;D. Schmitz;J. Arbiol;S. Estradé;J. Cornil;B. Martínez
我们给出了氧化镁薄膜中铁磁性出现的理论和实验证据。第一性原理计算允许预测在氧化镁中形成局域力矩的可能性，前提是镁空位的存在会在O2p为主的价带附近的受主能级上产生空穴。磁性测量证明了氧化镁薄膜中存在室温铁磁性。高分辨电子显微镜表明，我们的样品中存在阳离子空位。最后，利用x射线磁性圆二色谱技术的元素特异性，我们还证明了该体系的磁矩是由镁空位周围氧原子的2p电子的自旋极化引起的。
We show both theoretical and experimental evidences of the appearance of ferromagnetism in MgO thin films. First principles calculations allow predicting the possibility of the formation of a local moment in MgO, provided the existence of Mg vacancies which create holes on acceptor levels near the O 2p-dominated valence band. Magnetic measurements evidence of the existence of room-temperature ferromagnetism in MgO thin films. High-resolution transmission electron microscopy demonstrates the existence of cation vacancies in our samples. Finally, by applying the element specificity of the x-ray magnetic circular dichroism technique, we also demonstrate that the magnetic moments of the system arise from the spin polarization of the 2p electrons of oxygen atoms surrounding Mg vacancies.