Ferrimagnetic insulators for spintronics: Beyond garnets
Ferrimagnetic insulators for spintronics: Beyond garnets
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DOI：
10.1063/5.0033259
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发表时间：
2021-01-14
影响因子：
3.2
通讯作者：
Li, Peng
中科院分区：
文献类型：
--
作者：
Emori, Satoru;Li, Peng
铁磁绝缘体作为具有高效磁化动力学的材料平台受到了广泛关注。外延铁石榴石薄膜是目前在“绝缘体自旋电子学”中应用最广泛的材料。“然而，该领域的进一步发展需要克服石榴石的缺点，例如，它们的结构复杂、生长温度高、与其它晶体材料不相容以及相对弱的垂直磁各向异性。在这个角度来看，我们的情况下，尖晶石铁氧体和六方晶系铁氧体的外延薄膜是可行的绝缘体自旋电子学的材料与互补的优势，经常使用的石榴石。具体而言，尖晶石铁氧体具有更简单的结构，可以在较低的温度下结晶，并且更适合与各种材料的相干集成;六方晶系铁氧体具有体积来源的巨大垂直各向异性，与石榴石相反，其中各向异性的强度受到界面应变的限制。绝缘体自旋电子学材料的扩展库将使新的物理见解和潜在的应用，超越目前可能与石榴石。
Ferrimagnetic insulators have gained much attention as material platforms with efficient magnetization dynamics. To date, epitaxial iron garnet thin films are the most widely used materials in the emerging field of "insulator spintronics." However, further advances in this field require overcoming the disadvantages of garnets-e.g., their complex structure, high growth temperature, incompatibility with other crystalline materials, and relatively weak perpendicular magnetic anisotropy. In this Perspective, we make the case that epitaxial thin films of spinel ferrites and hexagonal ferrites are viable materials for insulator spintronics with complementary advantages over the oft-used garnets. Specifically, spinel ferrites have a simpler structure, can crystallize at lower temperatures, and are more amenable to coherent integration with various materials; hexagonal ferrites possess enormous perpendicular anisotropy of bulk origin, in contrast to garnets where the strength of anisotropy is restricted by interfacial strain. The expanded repertoire of materials for insulator spintronics will enable new physical insights and potential applications, beyond what is currently possible with garnets.