High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness

Abstract Reported steady-state microwave emission in magnetic tunnel junction (MTJ)-based spin transfer torque nano-oscillators (STNOs) relies mostly on very thin insulating barriers [resulting in a resistance × area product (R × A) of ~1 Ωμm2] that can sustain large current densities and thus trigg...

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Autores principales:	J. D. Costa, S. Serrano-Guisan, B. Lacoste, A. S. Jenkins, T. Böhnert, M. Tarequzzaman, J. Borme, F. L. Deepak, E. Paz, J. Ventura, R. Ferreira, P. P. Freitas
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9267ca09d5b5472ea7782ac1f973d082
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spelling	oai:doaj.org-article:9267ca09d5b5472ea7782ac1f973d0822021-12-02T12:32:16ZHigh power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness10.1038/s41598-017-07762-z2045-2322https://doaj.org/article/9267ca09d5b5472ea7782ac1f973d0822017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07762-zhttps://doaj.org/toc/2045-2322Abstract Reported steady-state microwave emission in magnetic tunnel junction (MTJ)-based spin transfer torque nano-oscillators (STNOs) relies mostly on very thin insulating barriers [resulting in a resistance × area product (R × A) of ~1 Ωμm2] that can sustain large current densities and thus trigger large orbit magnetic dynamics. Apart from the low R × A requirement, the role of the tunnel barrier in the dynamics has so far been largely overlooked, in comparison to the magnetic configuration of STNOs. In this report, STNOs with an in-plane magnetized homogeneous free layer configuration are used to probe the role of the tunnel barrier in the dynamics. In this type of STNOs, the RF modes are in the GHz region with integrated matched output powers (P out ) in the range of 1–40 nW. Here, P o u t values up to 200 nW are reported using thicker insulating barriers for junctions with R × A values ranging from 7.5 to 12.5 Ωμm2, without compromising the ability to trigger self-sustained oscillations and without any noticeable degradation of the signal linewidth (Γ). Furthermore, a decrease of two orders of magnitude in the critical current density for spin transfer torque induced dynamics (J STT ) was observed, without any further change in the magnetic configuration.J. D. CostaS. Serrano-GuisanB. LacosteA. S. JenkinsT. BöhnertM. TarequzzamanJ. BormeF. L. DeepakE. PazJ. VenturaR. FerreiraP. P. FreitasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. D. Costa S. Serrano-Guisan B. Lacoste A. S. Jenkins T. Böhnert M. Tarequzzaman J. Borme F. L. Deepak E. Paz J. Ventura R. Ferreira P. P. Freitas High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness
description	Abstract Reported steady-state microwave emission in magnetic tunnel junction (MTJ)-based spin transfer torque nano-oscillators (STNOs) relies mostly on very thin insulating barriers [resulting in a resistance × area product (R × A) of ~1 Ωμm2] that can sustain large current densities and thus trigger large orbit magnetic dynamics. Apart from the low R × A requirement, the role of the tunnel barrier in the dynamics has so far been largely overlooked, in comparison to the magnetic configuration of STNOs. In this report, STNOs with an in-plane magnetized homogeneous free layer configuration are used to probe the role of the tunnel barrier in the dynamics. In this type of STNOs, the RF modes are in the GHz region with integrated matched output powers (P out ) in the range of 1–40 nW. Here, P o u t values up to 200 nW are reported using thicker insulating barriers for junctions with R × A values ranging from 7.5 to 12.5 Ωμm2, without compromising the ability to trigger self-sustained oscillations and without any noticeable degradation of the signal linewidth (Γ). Furthermore, a decrease of two orders of magnitude in the critical current density for spin transfer torque induced dynamics (J STT ) was observed, without any further change in the magnetic configuration.
format	article
author	J. D. Costa S. Serrano-Guisan B. Lacoste A. S. Jenkins T. Böhnert M. Tarequzzaman J. Borme F. L. Deepak E. Paz J. Ventura R. Ferreira P. P. Freitas
author_facet	J. D. Costa S. Serrano-Guisan B. Lacoste A. S. Jenkins T. Böhnert M. Tarequzzaman J. Borme F. L. Deepak E. Paz J. Ventura R. Ferreira P. P. Freitas
author_sort	J. D. Costa
title	High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness
title_short	High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness
title_full	High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness
title_fullStr	High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness
title_full_unstemmed	High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness
title_sort	high power and low critical current density spin transfer torque nano-oscillators using mgo barriers with intermediate thickness
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9267ca09d5b5472ea7782ac1f973d082
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High power and low critical current density spin transfer torque nano-oscillators using MgO barriers with intermediate thickness

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