Ferromagnetic resonance measurements of (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy

• Multilayers of [Co/Ni(t)/Co/Pt]×8 with varying Ni thickness were investigated for possible use as a free layer in magnetic tunnel junctions and spintronics devices. The thickness t of the Ni sub-layer was varied from 0.3 nm to 0.9 nm and the resulting magnetic properties were compared with (Co/Ni) and (Co/Pt) multilayers. As determined from magnetic force microscopy, magnetometry and ferromagnetic resonance measurements, all multilayers exhibited perpendicular magnetic anisotropy. Compared with (Co/Pt) multilayers, the sample with t of 0.9 nm showed almost the same anisotropy field of μ 0 H k = 1.15 T but the damping constant was 40% lower. These characteristics make these multilayers attractive for spin torque based magnetoresistive devices with perpendicular anisotropy.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

ferromagnetic resonance

magnetic force microscopy

magnetic multilayers

perpendicular magnetic anisotropy

Anisotropy

Ferromagnetic materials

Ferromagnetism

Magnetic anisotropy

Magnetism

Multilayers

Nickel

Resonance

Tunnel junctions

Anisotropy field

Damping constants

Ferromagnetic resonance measurements

Magnetic tunnel junction

Magnetoresistive devices

Perpendicular anisotropy

Spintronics device

magnetic multilayers

perpendicular magnetic anisotropy

magnetic force microscopy

ferromagnetic

spin-torque oscillator

droplet solitons

Physics

Publication and Content Type

ref (subject category)

art (subject category)