Collective magnetic and plasma excitations in Josephson ψ junctions

S. V. Mironov; A. I. Buzdin

doi:10.1103/PhysRevB.104.134502

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Collective magnetic and plasma excitations in Josephson ψ junctions

S. V. Mironov, A. I. Buzdin

DOI 10.1103/PhysRevB.104.134502 · Physical Review B

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Abstract

We show that Josephson ψ junctions with a half-metallic (HM) weak link coupled to superconducting (S) electrodes through ferromagnetic (F) layers host collective excitations of the magnetic moment and the Josephson phase. This results in a shift of the ferromagnetic resonance frequency, anomalies in the current-voltage characteristics, and the appearance of additional magnetic anisotropy in the F layers. In contrast to previously studied S/F/S junctions, coupling between magnetic and plasma modes emerges even in the long wavelength limit. Such coupling is shown to enable controllable magnetization reversal in the F layer governed by a dc current pulse, which provides an effective mechanism for the magnetic moment manipulation in the devices of superconducting spintronics.