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

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 c...

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Published in:Applied physics letters 2013-10, Vol.103 (18), p.182401
Main Authors: Burrowes, C., Vernier, N., Adam, J.-P., Herrera Diez, L., Garcia, K., Barisic, I., Agnus, G., Eimer, S., Kim, Joo-Von, Devolder, T., Lamperti, A., Mantovan, R., Ockert, B., Fullerton, E. E, Ravelosona, D.
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cited_by cdi_FETCH-LOGICAL-c297t-6e8868685680d866c6b9f7627a7e766844c4809bc6268376b6cae67fa43b1a723
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container_end_page
container_issue 18
container_start_page 182401
container_title Applied physics letters
container_volume 103
creator Burrowes, C.
Vernier, N.
Adam, J.-P.
Herrera Diez, L.
Garcia, K.
Barisic, I.
Agnus, G.
Eimer, S.
Kim, Joo-Von
Devolder, T.
Lamperti, A.
Mantovan, R.
Ockert, B.
Fullerton, E. E
Ravelosona, D.
description 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.
doi_str_mv 10.1063/1.4826439
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title Low depinning fields in Ta-CoFeB-MgO ultrathin films with perpendicular magnetic anisotropy
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