Resonant enhancement of damping within the free layer of a microscale magnetic tunnel valve | Zendy

P. S. Keatley | Zendy; V. V. Kruglyak | Zendy; Andreas Neudert | Zendy; R. J. Hicken | Zendy; V. D. Poimanov | Zendy; J. R. Childress | Zendy; J. A. Katine | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Resonant enhancement of damping within the free layer of a microscale magnetic tunnel valve

Author(s) -

P. S. Keatley,

V. V. Kruglyak,

Andreas Neudert,

R. J. Hicken,

V. D. Poimanov,

J. R. Childress,

J. A. Katine

Publication year - 2015

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4907701

Subject(s) - condensed matter physics , magnetometer , magnetization dynamics , materials science , magnetization , coupling (piping) , relaxation (psychology) , magnetic damping , kerr effect , layer (electronics) , microscale chemistry , magnetic field , physics , composite material , psychology , social psychology , vibration , mathematics education , mathematics , quantum mechanics , nonlinear system

Picosecond magnetization dynamics in the free and pinned layers of a microscale magnetic tunnel valve have been studied using time-resolved scanning Kerr microscopy. A comparison of the observed dynamics with those of individual free and pinned layers allowed the effect of interlayer coupling to be identified. A weak interlayer coupling in the tunnel valve continuous film reference sample was detected in bulk magnetometry measurements, while focused Kerr magnetometry showed that the coupling was well maintained in the patterned structure. In the tunnel valve, the free layer precession was observed to have reduced amplitude and an enhanced relaxation. During magnetization reversal in the pinned layer, its frequency approached that of the low frequency mode associated with the free layer. At the pinned layer switching field, the linewidth of the free layer became similar to that of the pinned layer. The similarity in their frequencies promotes the formation of precessional modes that exhibit strong collective properties such as frequency shifting and enhanced linewidth, while inhomogeneous magnetization of the pinned layer during reversal may also play a role in these observations. The collective character of precessional dynamics associated with mixing of the free and pinned layer magnetization dynamics must be accounted for even in tunnel valves with a small interlayer coupling

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research