Abstract
The propagation characteristics of backward-volume magnetostatic spin-waves in epitaxial Fe(001) films were studied by frequency-domain and time-domain spin-wave propagation spectroscopies using a vector network analyser. Due to the combination of cubic-magnetocrystalline anisotropy and anisotropic spin-wave dispersion, the backward-volume spin-wave exhibited a complicated packet propagation. For the hard-axis propagation, the group velocity of the spin wave was greatly enhanced at low external magnetic fields and propagation occurred even under no magnetic field. By analysing within a theoretical model and micromagnetic simulations, these transmission character of the backward-volume magnetostatic spin-waves in an epitaxial iron film was well reproduced. The observed characteristics are essential information to promote two-dimensional magnonic devices utilizing cubic-anisotropic materials.
Highlights
The development of nanoscale electronics has drastically improved the performance of computers which sustain various industries and our daily lives
An epitaxial iron (Fe) film was reported to be a promising spin-wave medium;18 by adjusting the relative orientation of magnetization with respect to the cubic magnetocrystallineanisotropy axes of Fe, the amplitude of magnetostatic surface spinwaves (MSSWs) was enhanced by a factor of 28, and the decay length and group velocity were increased to a sufficient level for practical applications
The saturation magnetization Ms = (1.6 ± 0.1) × 106 A/m and the cubic magnetocrystalline anisotropy field μ0HA = (66 ± 2) mT of the epitaxial Fe films were determined by a vibrating sample magnetometer
Summary
The development of nanoscale electronics has drastically improved the performance of computers which sustain various industries and our daily lives. An epitaxial iron (Fe) film was reported to be a promising spin-wave medium; by adjusting the relative orientation of magnetization with respect to the cubic magnetocrystallineanisotropy axes of Fe, the amplitude of magnetostatic surface spinwaves (MSSWs) was enhanced by a factor of 28, and the decay length and group velocity were increased to a sufficient level for practical applications. This new type of spin-wave nonreciprocity was discovered to function as a magnonic logic device.
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