Buffer Layer Dependence of the FMR Linewidth for Ni80Fe20 Thin Films.

Mizukami, Shigemi; Ando, Yasuo; Miyazaki, T.

doi:10.3379/jmsjmag.24.535

Cited by 20 publications

(38 citation statements)

References 6 publications

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“…9 This is in qualitative agreement with Ref. 8, where the increase in damping for a Ta cap was so slight as to not be detectable to within the experimental uncertainty.…”

Section: Discussionsupporting

confidence: 87%

“…8,9 For the case of a Pt capping layer the enhanced damping was a factor of 2 greater than the damping inferred from samples without a capping layer. However, for a Cu capping layer, the effect upon damping was inconclusive as measured to within the signal-to-noise ratio of the experiment.…”

Section: Theorymentioning

confidence: 87%

“…[7][8][9][10][11] However, there has not yet been any systematic study of damping in simple Permalloy/ Cu bilayer samples. Due to the s-like character of carriers in Cu, the spin lifetime is relatively long.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced ferromagnetic damping in Permalloy∕Cu bilayers

Gerrits

Schneider

Silva

2006

Journal of Applied Physics

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We have investigated the enhancement of ferromagnetic damping for thin Permalloy (Ni80Fe20) films grown with Cu capping layers of variable thickness (5–1000 nm). The measurements were performed with a pulsed inductive microwave magnetometer in the frequency range between 2.3 and 2.7 GHz. The damping was enhanced if the Cu layers were thicker than the spin-diffusion length of ls≈250nm. For example, the damping was enhanced by 30% for a Permalloy (3nm)∕Cu (1000 nm) bilayer relative to the damping for Permalloy with a 5-nm-thick Cu capping layer. Existing theory for spin pumping from the Permalloy layer into the Cu layer was used to model the additional contribution to damping for these bilayer systems. Additional experiments on Permalloy (5nm)∕Cu(xnm)∕Ta (5 nm) provided indirect evidence for spin accumulation inside the Cu layer.

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“…9 This is in qualitative agreement with Ref. 8, where the increase in damping for a Ta cap was so slight as to not be detectable to within the experimental uncertainty.…”

Section: Discussionsupporting

confidence: 87%

Section: Theorymentioning

confidence: 87%

See 1 more Smart Citation

Enhanced ferromagnetic damping in Permalloy∕Cu bilayers

Gerrits

Schneider

Silva

2006

Journal of Applied Physics

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“…An interesting situation arises when the layer N1 is a bad spin sink, such as Cu, and N2 is a perfect spin sink, such as Pt. 10 Mizukami et al 21,22 experimentally studied the FMR linewidth in permalloy ͑Py͉͒Cu͉Pt composites as a function of Cu (N1) width L. Next to L, there are three relevant length scales in the problem: The Fermi wavelength, F , the elastic scattering mean-free path, el , and the spin-diffusion length, sd . In the coherent regime, LϽ F , we do not expect large effects of a dusting N1 layer on the mixing conductance, which means that the damping enhancement ͓Eq.…”

Section: ͑3͒mentioning

confidence: 99%

Dynamic exchange coupling and Gilbert damping in magnetic multilayers (invited)

Tserkovnyak

Brataas

Bauer

2003

Journal of Applied Physics

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Temperature dependent magnetic properties of a Co ∕ Pd multilayer thin film J. Appl. Phys. 97, 10J105 (2005); 10.1063/1.1849671 Effects of nonlocal interlayer exchange in spin dynamics of a magnetic metal superlattice Low Temp. Phys. 24, 624 (1998); 10.1063/1.593648 Simple full micromagnetic model of exchange bias behavior in ferro/antiferromagnetic layered structures (abstract)We theoretically study dynamic properties of thin ferromagnetic films in contact with normal metals. Moving magnetizations cause a flow of spins into adjacent conductors, which relax by spin flip, scatter back into the ferromagnet, or are absorbed by another ferromagnet. Relaxation of spins outside the moving magnetization enhances the overall damping of the magnetization dynamics in accordance with the Gilbert phenomenology. Transfer of spins between different ferromagnets by these nonequilibrium spin currents leads to a long-ranged dynamic exchange interaction and collective excitation modes. Our predictions agree well with recent ferromagnetic-resonance experiments on ultrathin magnetic films.

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“…An attractive possible means to overcome this problem is to use pure spin current for operation of these devices because the absence of an electric current in the pure spin current is expected to significantly reduce the power consumption due to Joule heating. The pure spin current is generated by several methods, such as spin pumping, spin-Hall effect, or spin-Seebeck effect [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%