Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/123456789/19868
Title: Coherent microwave generation by spintronic feedback oscillator
Authors: KUMAR, D
KONISHI, K
KUMAR, N
MIWA, S
FUKUSHIMA, A
YAKUSHIJI, K
YUASA, S
KUBOTA, H
TOMY, CV
PRABHAKAR, A
SUZUKI, Y
TULAPURKAR, A
Keywords: Spin-Polarized Current
Driven
Issue Date: 2016
Publisher: NATURE PUBLISHING GROUP
Citation: Scientific Reports,6,
Abstract: The transfer of spin angular momentum to a nanomagnet from a spin polarized current provides an efficient means of controlling the magnetization direction in nanomagnets. A unique consequence of this spin torque is that the spontaneous oscillations of the magnetization can be induced by applying a combination of a dc bias current and a magnetic field. Here we experimentally demonstrate a different effect, which can drive a nanomagnet into spontaneous oscillations without any need of spin torque. For the demonstration of this effect, we use a nano-pillar of magnetic tunnel junction (MTJ) powered by a dc current and connected to a coplanar waveguide (CPW) lying above the free layer of the MTJ. Any fluctuation of the free layer magnetization is converted into oscillating voltage via the tunneling magneto-resistance effect and is fed back into the MTJ by the CPW through inductive coupling. As a result of this feedback, the magnetization of the free layer can be driven into a continual precession. The combination of MTJ and CPW behaves similar to a laser system and outputs a stable rf power with quality factor exceeding 10,000.
URI: http://dx.doi.org/10.1038/srep30747
http://localhost:8080/xmlui/handle/123456789/19868
ISSN: 2045-2322
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