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Vargas, Nicolás M.
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article
A quantum material spintronic resonator
Abstract
<jats:title>Abstract</jats:title><jats:p>In a spintronic resonator a radio-frequency signal excites spin dynamics that can be detected by the spin-diode effect. Such resonators are generally based on ferromagnetic metals and their responses to spin torques. New and richer functionalities can potentially be achieved with quantum materials, specifically with transition metal oxides that have phase transitions that can endow a spintronic resonator with hysteresis and memory. Here we present the spin torque ferromagnetic resonance characteristics of a hybrid metal-insulator-transition oxide/ ferromagnetic metal nanoconstriction. Our samples incorporate <jats:inline-formula><jats:alternatives><jats:tex-math>{ {V}}_2{ {O}}_3</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>, with Ni, Permalloy (<jats:inline-formula><jats:alternatives><jats:tex-math>{ {Ni}}_{80}{ {Fe}}_{20}</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Ni</mml:mtext><mml:mn>80</mml:mn></mml:msub><mml:msub><mml:mtext>Fe</mml:mtext><mml:mn>20</mml:mn></mml:msub></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>) and Pt layers patterned into a nanoconstriction geometry. The first order phase transition in <jats:inline-formula><jats:alternatives><jats:tex-math>{ {V}}_2{ {O}}_3</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math></jats:alternatives></jats:inline-formula> is shown to lead to systematic changes in the resonance response and hysteretic current control of the ferromagnetic resonance frequency. Further, the output signal can be systematically varied by locally changing the state of the <jats:inline-formula><jats:alternatives><jats:tex-math>{ {V}}_2{ {O}}_3</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math></jats:alternatives></jats:inline-formula> with a dc current. These results demonstrate new spintronic resonator functionalities of interest for neuromorphic computing.</jats:p>