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Tuning exchange-dominated spin-waves using lateral current spread in nanocontact spin-torque nano-oscillators

Journal article
Authors Mazoumeh Fazlali
Seyed Amir Hossein Banuazizi
Martina Ahlberg
Mykola Dvornik
Sohrab Sani
Seyed Majid Mohseni
Johan Åkerman
Published in Journal of Magnetism and Magnetic Materials
Volume 492
ISSN 0304-8853
Publication year 2019
Published at Department of Physics (GU)
Language en
Links JOURNAL OF MAGNETISM AND MAGNETIC M...
Keywords spin-wave, spin torque nano-oscillator, ferromagnetic resonance
Subject categories Physical Sciences

Abstract

We present an efficient method to tailor propagating spin waves in quasi-confined systems. We use nanocontact spin-torque nano-oscillators based on NiFe/Cu/Co spin-valves and study the ferromagnetic and spin-wave resonances (FMR and SWR) of both layers. We employ homodyne-detected ferromagnetic resonance spectroscopy, resembling spin-torque FMR, to detect the magnetodynamics. The external field is applied in-plane, giving a parallel configuration of the magnetic layers, which do not provide any spin-transfer torque. Instead, the excitation is caused by the Oersted field. By varying the thickness of the bottom Cu electrode (t(Cu)) of the devices, we tune the current distribution in the samples, and thereby the Oersted field, which governs the spin wave characteristics. Both the average k-vector and the bandwidth of the SWR increases as t(Cu) increases.

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