Tuning of magnetization relaxation in ferromagnetic thin films through seed layers

Lü, Lei; Young, Jared; Wu, Mingzhong; Mathieu, C.; Hadley, Matthew; Krivošı́k, Pavol; Mo, Nan

doi:10.1063/1.3675614

Cited by 23 publications

(11 citation statements)

References 14 publications

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“…27, 28 We also did not observe a significant change in the grain size of film with thickness of Ru, suggesting the absence of grain-grain TMS and grain boundary TMS. 20,29 The enhanced damping that results from spin pumping is given by 30…”

Section: Resultsmentioning

confidence: 99%

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Effect of Ru thickness on spin pumping in Ru/Py bilayer

Behera

Singh

Chaudhary

et al. 2015

Journal of Applied Physics

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We report the effect of Ru thickness (t Ru ) on ferromagnetic resonance (FMR) line-width of Ru(t Ru )/Py(23 nm) bilayer samples grown on Si(100)/SiO 2 substrates at room temperature by magnetron sputtering. The FMR line-width is found to vary linearly with frequency for all thicknesses of Ru, indicating intrinsic origin of damping. For Ru thicknesses below 15 nm, Gilbert-damping parameter, a is almost constant. We ascribe this behavior to spin back flow that is operative for Ru thicknesses lower than the spin diffusion length in Ru, k sd . For thicknesses >15 nm (>k sd ), the damping constant increases with Ru thickness, indicating spin pumping from Py into Ru. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Resultsmentioning

confidence: 99%

“…17 However, studies on Ru/FM are limited. [18][19][20] In fact, it is not yet established, if Ru can act as a good NM for spin pumping from the FM.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ru thickness on spin pumping in Ru/Py bilayer

Behera

Singh

Chaudhary

et al. 2015

Journal of Applied Physics

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“…The somewhat less accurate fit of the 12.2 GHz signal might be attributed to a greater role of inhomogeneous broadening in the signal, which could be treated using a Gaussian convolution, as in Ref. 17. Plots of the absorption and emission peak amplitudes as a function of the input 6.1 GHz power, shown in Fig.…”

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confidence: 99%

High-efficiency gigahertz frequency doubling without power threshold in thin-film Ni81Fe19

Cheng

Bailey

2013

Applied Physics Letters

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We demonstrate efficient second-harmonic generation at moderate input power for thin film Ni 81 Fe 19 undergoing ferromagnetic resonance (FMR). Powers of the generated second-harmonic are shown to be quadratic in input power, with an upconversion ratio three orders of magnitude higher than that demonstrated in ferrites 1 , definedwhere ∆P is the change in the transmitted rf power and P is the input rf power. The second harmonic signal generated exhibits a significantly lower linewidth than that predicted by low-power Gilbert damping, and is excited without threshold. Results are in good agreement with an analytic, approximate expansion of the Landau-Lifshitz-Gilbert (LLG) equation.

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“…This direction of research is developed not only in the context of potential applications [e.g., within spintronics (in particular, spin transfer torque devices) and magnonic devices] but also to understand fundamental experimental results in the physics of magnetism. [16][17][18][19][20][21] There are two contributions to spin relaxation usually identified, intrinsic and extrinsic. The former is usually related to the spin-orbit coupling and is described by the phenomenological Gilbert damping term.…”

Section: Introductionmentioning

confidence: 99%

Investigation of spin wave damping in three-dimensional magnonic crystals using the plane wave method

et al. 2012

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The Landau-Lifshitz equation with a scalar damping constant predicts that the damping of spin waves propagating in an infinite homogeneous magnetic medium does not depend on the direction of propagation. This is not the case in materials with a periodic arrangement of magnetic constituents (known as magnonic crystals). In this paper, the plane wave method is extended to include damping in the calculation of the dispersion and relaxation of spin waves in three-dimensional magnonic crystals. A model material system is introduced and calculations are then presented for magnonic crystals realized in the direct and inverted structure and for two different filling fractions. The ability of magnonic crystals to support the propagation of spin waves is characterized in terms of a figure of merit, defined as the ratio of the spin wave frequency to the decay constant. The calculations reveal that in magnonic crystals with a modulated value of the relaxation constant, the figure of merit depends strongly on the frequency and wave vector of the spin waves, with the dependence determined by the spatial distribution of the spin wave amplitude within the unit cell of the magnonic crystal. Bands and directions of exceptionally long spin wave propagation have been identified. The results are also discussed in terms of the use of magnonic crystals as metamaterials with designed magnetic permeability.

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Tuning of magnetization relaxation in ferromagnetic thin films through seed layers

Cited by 23 publications

References 14 publications

Effect of Ru thickness on spin pumping in Ru/Py bilayer

Effect of Ru thickness on spin pumping in Ru/Py bilayer

High-efficiency gigahertz frequency doubling without power threshold in thin-film Ni81Fe19

Investigation of spin wave damping in three-dimensional magnonic crystals using the plane wave method

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