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Reduced spin torque nano-oscillator linewidth using He+ irradiation
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics. 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
KTH, School of Engineering Sciences (SCI), Applied Physics. Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..ORCID iD: 0000-0001-9107-3309
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2020 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 116, no 7, article id 072403Article in journal (Refereed) Published
Abstract [en]

We demonstrate an approach for improving the spectral linewidth of a spin torque nano-oscillator (STNO). Using He + ion irradiation, we tune the perpendicular magnetic anisotropy (PMA) of the STNO free layer such that its easy axis is gradually varied from strongly out-of-plane to moderate in-plane. As the PMA impacts the non-linearity N of the STNO, we can, in this way, control the threshold current, the current tunability of the frequency, and, in particular, the STNO linewidth, which dramatically improves by two orders of magnitude. Our results are in good agreement with the theory for nonlinear auto-oscillators, confirm theoretical predictions of the role of the nonlinearity, and demonstrate a straightforward path toward improving the microwave properties of STNOs.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2020. Vol. 116, no 7, article id 072403
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URN: urn:nbn:se:kth:diva-271742DOI: 10.1063/1.5137837ISI: 000519602100003Scopus ID: 2-s2.0-85080118667OAI: oai:DiVA.org:kth-271742DiVA, id: diva2:1422614
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QC 20200408

Available from: 2020-04-08 Created: 2020-04-08 Last updated: 2020-04-08Bibliographically approved

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Jiang, ShengChung, SunjaeLe, Quang TuanÅkerman, Johan

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