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Magnetodynamics in orthogonal nanocontact spin-torque nano-oscillators based on magnetic tunnel junctions
KTH, School of Engineering Sciences (SCI), Applied Physics. Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..ORCID iD: 0000-0003-1909-437x
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
KTH, School of Engineering Sciences (SCI), Applied Physics. Korea Natl Univ Educ, Dept Phys Educ, Cheongju 28173, South Korea..ORCID iD: 0000-0002-9970-0060
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden.;NanOsc AB, S-16440 Kista, Sweden..
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2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 115, no 15, article id 152402Article in journal (Refereed) Published
Abstract [en]

We demonstrate field and current controlled magnetodynamics in nanocontact spin-torque nano-oscillators based on orthogonal magnetic tunnel junctions. We systematically analyze the microwave properties (frequency f, linewidth Delta f, power P, and frequency tunability df/dI) with their physical origins-perpendicular magnetic anisotropy, dampinglike and fieldlike spin transfer torque (STT), and voltage-controlled magnetic anisotropy (VCMA). These devices present several advantageous characteristics: high emission frequencies (f>20 GHz), high frequency tunability (df/dI=0.25 GHz/mA), and zero-field operation (f similar to 4 GHz). Furthermore, detailed investigation of f(H, I) reveals that df/dI is mostly governed by the large VCMA [287 fJ/(V m)], while STT plays a negligible role.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019. Vol. 115, no 15, article id 152402
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Physical Sciences
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URN: urn:nbn:se:kth:diva-263675DOI: 10.1063/1.5121356ISI: 000492035500038Scopus ID: 2-s2.0-85073259843OAI: oai:DiVA.org:kth-263675DiVA, id: diva2:1368750
Note

QC 20191108

Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-08Bibliographically approved

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Jiang, ShengÅkerman, Johan

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