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Reduced spin torque nano-oscillator linewidth using He+ irradiation

Jiang, Sheng (author)
Gothenburg University,Göteborgs universitet,KTH,Material- och nanofysik,Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden.,Institutionen för fysik (GU),Department of Physics (GU)
Khymyn, Roman (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Chung, Sunjae (author)
KTH,Tillämpad fysik,Korea Natl Univ Educ, Dept Phys Educ, Cheongju 28173, South Korea.
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Le, Quang Tuan, 1976- (author)
Gothenburg University,Göteborgs universitet,KTH,Tillämpad fysik,Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden.,Institutionen för fysik (GU),Department of Physics (GU)
Diez, Liza Herrera (author)
Univ Paris Saclay, Ctr Nanosci & Nanotechnol, CNRS, F-91120 Palaiseau, France.
Houshang, Afshin (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Zahedinejad, Mohammad, 1986 (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Ravelosona, Dafine (author)
Univ Paris Saclay, Ctr Nanosci & Nanotechnol, CNRS, F-91120 Palaiseau, France.;Spin Ion Technol, 10 Blvd Thomas Gobert, F-91120 Palaiseau, France.
Åkerman, Johan (author)
Gothenburg University,Göteborgs universitet,KTH,Material- och nanofysik,Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden.;NanOsc AB, S-16440 Kista, Sweden.,Institutionen för fysik (GU),Department of Physics (GU)
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 (creator_code:org_t)
AMER INST PHYSICS, 2020
2020
English.
In: Applied Physics Letters. - : AMER INST PHYSICS. - 0003-6951 .- 1077-3118. ; 116:7
Related links:
https://hal.archives...
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https://urn.kb.se/re...
https://doi.org/10.1...
https://gup.ub.gu.se...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)
NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

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