Spin-Wave Resonance in (Fe 0.82 Ni 0.18 )/V Nanostructure
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DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM
Spin-Wave Resonance in (Fe0.82Ni0.18)/V Nanostructure A. B. Rinkevicha,*, D. V. Perova,**, E. A. Kuznetsova, and V. V. Ustinova aMikheev
Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620108 Russia *e-mail: [email protected] **e-mail: [email protected]
Received May 13, 2019; revised May 13, 2019; accepted May 17, 2019
Abstract—We have studied the transmission of millimeter-range electromagnetic waves through (Fe0.82Ni0.18)/V nanostructure. The dependences of the transmission coefficient in the external magnetic field have been measured. The curves have a minimum caused by energy absorption under the ferromagnetic resonance conditions at frequencies 26–35.6 and 37–38 GHz. In a narrow frequency interval near 36 GHz, a complex pattern of resonance phenomena associated with ferromagnetic and spin-wave resonances is observed. We have calculated the field dependence of the transmission coefficient. It has been established that the model of a homogeneous magnetic metal plate used in calculations makes it possible to reproduce some features of resonant changes in the transmission coefficient, which are induced by ferromagnetic and spin-wave resonances. DOI: 10.1134/S106377611909005X
1. INTRODUCTION The application of spintronics effects for controlling over spin wave propagation opens new possibilities for obtaining nanooscillators as well as for transforming spin currents into electric currents and vice versa [1–3]. Theoretical description of propagation of spin waves in films and nanostructures requires the inclusion of the magnetic-dipole and exchange interactions as well as boundary conditions for spins at boundaries and magnetic inhomogeneities [4, 5]. The spectrum of inhomogeneous ferromagnetic resonance modes in metal superlattices was calculated in [6]. The most serious difficulty in the application of spin waves in metal nanostructures in magnonics and spintronics devices is their strong damping [7]. However, this damping can be compensated due to the spin–orbit torque effect [8, 9]. Spin-wave resonance spectra in three-layer structures and superlattices were studied in [10, 11]. The existence of gaps in the spin wave spectrum due to periodic modulation of the exchange interaction in superlattices was confirmed experimentally in [12]. Spin-wave resonance spectra for metal films and nanostructures were used in [13] to obtaining information on spin-wave stiffness and surface anisotropy constants. Several methods were developed for observing spin-wave resonance [14–16]. In analysis of metal films and nanostructures, the effect of microwave vortex currents and spin effect must be considered [17, 18]. The method of penetration of waves through thin metal films and nanostructures proved to be quite
effective beginning from investigation of the ferromagnetic antiresonance (FMAR) [19]. This method was used in [20, 21] for studying the microwave giant magnetoresonance effect and exchange-coupled metal nanostructures. The advantage
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