Low depinning fields in Ta-CoFeB-MgO ultrathin films with perpendicular magnetic anisotropy | Zendy

C. Burrowes | Zendy; N. Vernier | Zendy; JeanPaul Adam | Zendy; L. Herrera Diez | Zendy; K. Garcia | Zendy; I. Barisic | Zendy; Guillaume Agnus | Zendy; Sylvain Eimer | Zendy; Joo-Von Kim | Zendy; T. Devolder | Zendy; Alessio Lamperti | Zendy; R. Mantovan | Zendy; B. Ockert | Zendy; Eric E. Fullerton | Zendy; D. Ravelosona | Zendy

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Low depinning fields in Ta-CoFeB-MgO ultrathin films with perpendicular magnetic anisotropy

Author(s) -

C. Burrowes,

N. Vernier,

JeanPaul Adam,

L. Herrera Diez,

K. Garcia,

I. Barisic,

Guillaume Agnus,

Sylvain Eimer,

Joo-Von Kim,

T. Devolder,

Alessio Lamperti,

R. Mantovan,

B. Ockert,

Eric E. Fullerton,

D. Ravelosona

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4826439

Subject(s) - condensed matter physics , materials science , spintronics , ferromagnetism , perpendicular , amorphous solid , anisotropy , magnetic anisotropy , magnetic field , domain wall (magnetism) , magnetization , physics , crystallography , optics , chemistry , geometry , mathematics , quantum mechanics

We have studied the domain-wall dynamics in Ta-CoFeB-MgO ultra-thin films with perpendicular magnetic anisotropy for various Co and Fe concentrations in both the amorphous and crystalline states. We observe three motion regimes with increasing magnetic field, which are consistent with a low fields creep, transitory depinning, and high fields Walker wall motion. The depinning fields are found to be as low as 2 mT, which is significantly lower than the values typically observed in 3d ferromagnetic metal films with perpendicular magnetic anisotropy. This work highlights a path toward advanced spintronics devices based on weak random pinning in perpendicular CoFeB films.

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