Ultrathin Ferrimagnetic GdFeCo Films with Low Damping

• 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.

Ämnesord

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)

Nyckelord

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

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