Spin dynamics in point contacts to single ferromagnetic films

Abstract

Excitation of magnons or spin-waves driven by nominally unpolarized transport currents in point contacts of normal and ferromagnetic metals is probed by irradiating the contacts with microwaves. Two characteristic dynamic effects are observed: a rectification of off-resonance microwave current by spin-wave nonlinearities in the point contact conductance, and a resonant stimulation of spin-wave modes in the nano-contact core by the microwave field. These observations provide a direct evidence that the magnetoconductance effects observed are due to GHz spin dynamics at the ferromagnetic interface driven by the spin transfer torque effect of the transport current.

References in corpus (9)

• Spintronics: Fundamentals and applications
• Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
• Macrospin Models of Spin Transfer Dynamics
• Current-Driven Microwave Dynamics in Magnetic Point Contacts as a Function of Applied Field Angle
• Spin-Torque Driven Magnetization Dynamics: Micromagnetic Modelling
• Current-induced spin-wave excitations in a single ferromagnetic layer
• Current Induced Excitations in Cu/Co/Cu Single Ferromagnetic Layer Nanopillars
• Spin-Transfer Excitations of Permalloy Nanopillars for Large Applied Currents
• Surface Spin-valve Effect

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• Stimulated emission and absorption of photons in magnetic point contacts: toward metal-based spin-lasers
• Mechanisms of nonlinear spin-wave emission from a microwave driven nanocontact
• Current Driven tri-stable Resistance States in Magnetic Point Contacts
• Magnon modes as a joint effect of surface ferromagnetism and spin-orbite coupling in CoSi chiral topological semimetal
• Spin wave effects in transport between a ferromagnet and a Weyl semimetal surface
• Current-field diagram of magnetic states of a surface spin valve in a point contact with a single ferromagnetic film
• Spin-valve effect for spin-polarized surface states in topological semimetals