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Ultrathin Ferrimagnetic GdFeCo Films with Low Damping

Bainsla, Lakhan (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Kumar, Akash (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Awad, Ahmad (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Wang, Chunlei (author)
KTH,Material- och nanofysik
Zahedinejad, Mohammad, 1986 (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Behera, Nilamani (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Fulara, Himanshu (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Khymyn, R. (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Houshang, Afshin (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
Weissenrieder, Jonas (author)
KTH,Material- och nanofysik
Åkerman, Johan, 1970 (author)
Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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 (creator_code:org_t)
2022-03
2022
English.
In: Advanced Functional Materials. - : Wiley. - 1616-301X .- 1616-3028. ; 32:23, s. 2111693-
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Ferromagnetic materials dominate as the magnetically active element in spintronic devices, but come with drawbacks such as large stray fields and low operational frequencies. Compensated ferrimagnets provide an alternative as they combine the ultrafast magnetization dynamics of antiferromagnets with a ferromagnet-like spin-orbit-torque behavior. However, to use ferrimagnets in spintronic devices their advantageous properties must be retained also in ultrathin films (t < 10 nm). In this study, ferrimagnetic Gdx(Fe87.5Co12.5)1−x thin films in the thickness range t = 2–20 nm are grown on high resistance Si(100) substrates and studied using broadband ferromagnetic resonance measurements at room temperature. By tuning their stoichiometry, a nearly compensated behavior is observed in 2 nm Gdx(Fe87.5Co12.5)1−x ultrathin films for the first time, with an effective magnetization of (Formula presented.) = 0.02 T and a low effective Gilbert damping constant of α = 0.0078, comparable to the lowest values reported so far in 30 nm films. These results show great promise for the development of ultrafast and energy efficient ferrimagnetic spintronic devices.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

compensated ferrimagnets
ferromagnetic resonance
Gilbert damping constant
spintronics
tetrahertz oscillators
Cobalt alloys
Energy efficiency
Ferrimagnetism
Ferromagnetic materials
Ferromagnetism
Gadolinium alloys
Iron alloys
Magnetization
Spin dynamics
Ternary alloys
Ultrathin films
Active elements
Compensated ferrimagnet
Ferrimagnetics
Ferrimagnets
Magnetically actives
Spintronics device
Tetrahertz
Tetrahertz oscillator
Ultra-thin
Damping
compensated ferrimagnets
ferromagnetic resonance
Gilbert damping constant
spintronics
tetrahertz oscillators
Cobalt alloys
Energy efficiency
Ferrimagnetism
Ferromagnetic materials
Ferromagnetism
Gadolinium alloys
Iron alloys
Magnetization
Spin dynamics
Ternary alloys
Ultrathin films
Active elements
Compensated ferrimagnet
Ferrimagnetics
Ferrimagnets
Magnetically actives
Spintronics device
Tetrahertz
Tetrahertz oscillator
Ultra-thin
Damping

Publication and Content Type

ref (subject category)
art (subject category)

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