Ferromagnetism in the Ferromagnetic Yttrium Iron Garnet Film/Ferromagnetic Intermetallic Compound Heterostructure
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Ferromagnetism in the Ferromagnetic Yttrium Iron Garnet Film/Ferromagnetic Intermetallic Compound Heterostructure T. A. Shaikhulova, G. A. Ovsyannikova, *, K. Y. Constantiniana, A. A. Klimova, b, V. V. Demidova, K. L. Stankevicha, N. Tiercelinc, P. Pernodc, and S. A. Nikitova a Kotel’nikov
Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, 125009 Russia b Russian Technological University MIREA, Moscow, 119454 Russia c University of Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520-IEMN, Lille F-59000, France *e-mail: [email protected] Received March 26, 2020; revised March 26, 2020; accepted April 2, 2020
Abstract—We report on the investigations of the magnetic properties and ferromagnetic resonance in the heterostructure consisting of an epitaxial yttrium iron garnet (Y3Fe5O12) film and a nanometer rare-earth intermetallic superlattice comprised of the (TbCo2/FeCo)n exchange-coupled layers. The (TbCo2/FeCo)n superlattice exhibits the giant magnetostriction and the controlled magnetic anisotropy induced by a magnetic field or elastic stresses. The magnetic interaction of the films in the (TbCo2/FeCo)n/Y3Fe5O12 heterostructure has been experimentally established and the spin current flowing through their interface has been detected. Keywords: ferromagnetic resonance, heterostructure, superlattice, magnetic anisotropy, spin current DOI: 10.1134/S1063783420090279
1. INTRODUCTION A structure with the spin current generation consists, as a rule, of two layers: a magnetic metal or a dielectric and a nonmagnetic metal. The spin current can be detected using the inverse spin-Hall effect (ISHE) in a material with a strong spin–orbit coupling by converting it into a conductive current [1, 2]. However, ISHE spin current detectors can be based not only on nonmagnetic metals. As was shown in [3–5], magnetic metals, e.g., permalloy Ni81Fe19, Fe, Co, and Ni, can be used in spin current detectors. At the injection of the spin current into a ferromagnet, it is converted to the charge current due to the ISHE. It was shown that permalloy is characterized by the selfinduced ISHE [6, 7]. The (TbCo2/FeCo)n (TCFC) superlattices containing terbium Tb, an element with the strong spin– orbit coupling (the atomic weight is Z = 159), have a high Curie temperature (TCU ~ 420 K), giant magnetostriction, and controlled induced magnetic anisotropy [8, 9]. These properties of the TCFC films can be used to create spintronics elements. The strong spin– orbit coupling in TCFC holds out a hope of that these films can be used to detect the spin current using the ISHE. Ferromagnetic insulators, e.g., yttrium iron garnet Y3Fe5O12 (YIG), has an advantage over conducting ferromagnets due to the low attenuation of
spin excitations (the Hilbert parameter is α = 6–7 × 10–5) and the high Curie temperature (TCU = 560 K), which ensures the high-efficiency spin pumping at room temperature [10]. It was reported that the spin current arises at the contact between the YIG film and the ferromagnetic FeNi fi
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