Lowest energy loss in an ultrathin ferromagnetic film
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Lowest energy loss in an ultrathin ferromagnetic film William Bailey, Columbia University, DMR-0239724.

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Left ferromagnetic resonance
Lowest energy loss in an ultrathin ferromagnetic film William Bailey, Columbia University, DMR-0239724

Ferromagnetic metals lose energy as their magnetic moments change direction. The minimum rate of energy loss is given by the Gilbert relaxation rate G, a constant for a given metal. For the last 50 years, G has been known to be lowest in Fe, with G=57 MHz.

We have created an epitaxial alloy thin film, MgO/Fe0.73V0.27(8nm), with substantially reduced loss rate of G=35 MHz.

Left:

Ferromagnetic resonance

(FMR) linewidth as a function of radio frequency; G is proportional to slope. Bottom: Frequency linewidth f; V-alloy has reduced f.

C. Scheck, L. Cheng, I. Barsukov, Z. Frait, and

W. E. Bailey, Phys. Rev. Lett.98, 117601* (2007)

* Editors' Suggestion


Left ferromagnetic resonance

Role of energy loss (damping) in Ghz magnetic devices

W. Bailey, Columbia University, DMR-0239724

CPP read head

Suppress mag-noise:

low G

Integrated,

frequency-agile

GHz notch filter

(low G: high Q)

Suppress SMT-noise:

high G

N. Smith, APL

SMT-switched M-RAM

Spin momentum transfer

(critical current ~ G)

Slonczewski, JMMM

low G