Materials Science and Engineering Division , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States.
Mechanical and Aerospace Engineering Department , University of California, Los Angeles , Los Angeles , California 90095 , United States.
ACS Appl Mater Interfaces. 2018 Jul 25;10(29):24725-24732. doi: 10.1021/acsami.8b06249. Epub 2018 Jul 16.
The magnetoelastic behavior of multiferroic heterostructures-coupling of magnetic anisotropy or domain dynamics to structural deformations-has been intensively studied for developing materials for energy-efficient, spin-based applications. Here, we report on a large, interface-dominated magnetostriction in (Co/Ni)/Pb(MgNb)O-PbTiO multiferroic heterostructures. Ferromagnetic resonance spectroscopy under voltage-induced strains enabled estimation of the saturation magnetostriction as a function of Ni thickness. The volume and the interface components to the saturation magnetostriction are (6.6 ± 0.9) × 10 and (-2.2 ± 0.2) × 10 m, respectively. Similar to perpendicular magnetic anisotropy in Co/Ni, the large, negative magnetostriction originates from the Co/Ni interfaces. This interfacial functionality delivers an effect over 300% larger than the bulk contribution and can enable low-energy, nanoelectronic devices that combine the tunable magnetic and magnetostrictive properties of Co/Ni multilayers with the ferroelectric properties of Pb(MgNb)O-PbTiO.
多铁异质结构的磁弹性能-将磁各向异性或畴动力学与结构变形耦合-一直是开发用于节能、基于自旋的应用的材料的研究热点。在这里，我们报告了（Co/Ni）/Pb（MgNb）O-PbTiO 多铁异质结构中存在的大的、以界面为主的磁致伸缩。在电压诱导应变下的铁磁共振光谱使我们能够估计磁致伸缩饱和值作为 Ni 厚度的函数。磁致伸缩饱和值的体积和界面分量分别为（6.6 ± 0.9）×10 和（-2.2 ± 0.2）×10 m。类似于 Co/Ni 中的垂直磁各向异性，大的负磁致伸缩源于 Co/Ni 界面。这种界面功能提供的效果比体相贡献大 300%以上，可以实现低能量的纳米电子器件，将 Co/Ni 多层的可调磁和磁致伸缩性能与 Pb（MgNb）O-PbTiO 的铁电性能结合起来。
