Intrinsic and non-local Gilbert damping in polycrystalline nickel studied by Ti : sapphire laser fs spectroscopy

Walowski, Jakob; Kaufmann, Marija Djordjević; Lenk, Benjamin; Hamann, Christine; McCord, Jeffrey; Münzenberg, Markus

doi:10.1088/0022-3727/41/16/164016

Cited by 169 publications

(140 citation statements)

References 63 publications

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“…As we discuss in detail below, the initial decrease of the damping factor with frequency followed by a frequency-independent part (Fig. 1b) is typical of uniform ferromagnets and allows us to accurately infer the intrinsic Gilbert damping constant 12 . Similarly, the observed Kittel SWR modes of a uniform ferromagnet (Fig.…”

Section: Resultsmentioning

confidence: 98%

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

et al. 2013

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(Ga,Mn)As is at the forefront of spintronics research exploring the synergy of ferromagnetism with the physics and the technology of semiconductors. However, the electronic structure of this model spintronics material has been debated and the systematic and reproducible control of the basic micromagnetic parameters and semiconducting doping trends has not been established. Here we show that seemingly small departures from the individually optimized synthesis protocols yield non-systematic doping trends, extrinsic charge and moment compensation, and inhomogeneities that conceal intrinsic properties of (Ga,Mn)As. On the other hand, we demonstrate reproducible, well controlled and microscopically understood semiconducting doping trends and micromagnetic parameters in our series of carefully optimized epilayers. Hand-in-hand with the optimization of the material synthesis, we have developed experimental capabilities based on the magneto-optical pumpand-probe method that allowed us to simultaneously determine the magnetic anisotropy, Gilbert damping and spin stiffness constants from one consistent set of measured data.

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Section: Resultsmentioning

confidence: 98%

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

et al. 2013

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“…12 In addition, time domain measurements can also be used as an alternative to FMR in the frequency domain. Such time domain measurements can be performed by use of pulsed-inductive microwave magnetometry (PIMM), [12][13][14][15] optical pump-probe technique, [16][17][18][19][20] [refs] or a synchronized pulsed laser technique. 21 Although not a direct measurement of the dynamic susceptibility, the relationship between the resonance field and frequency can also be determined by use of Brillouin light scattering (BLS).…”

Section: Introductionmentioning

confidence: 99%

Precise determination of the spectroscopic g-factor by use of broadband ferromagnetic resonance spectroscopy

Shaw

Nembach

Silva

et al. 2013

Journal of Applied Physics

134

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We demonstrate that the spectroscopic g−factor can be determined with high precision and accuracy by broadband ferromagnetic resonance measurements and applying an asymptotic analysis to the data. Spectroscopic data used to determine the g−factor is always obtained over a finite range of frequencies, which can result in significant errors in the fitted values of the spectroscopic g−factor. We show that by applying an asymptotic analysis to broadband datasets, precise values of the intrinsic g−factor can be determined with errors well below 1 %, even when the exact form of the Kittel equation (which describes the relationship between the frequency and resonance field) is unknown. We demonstrate this methodology with measured data obtained for sputtered Ni 80 Fe 20 ("Permalloy") thin films of varied thicknesses, where we determine the bulk g−factor value to be 2.109 ± 0.003. Such an approach is further validated by application to simulated data that includes both noise and an anisotropy that is not included in the Kittel equation that was used in the analysis. Finally, we show a correlation of thickness and interface structure to the magnitude of the asymptotic behavior, which provide insight into additional mechanisms that may induce deviations from the Kittel equation.2

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“…The correlation time of the magnetic noise, i.e. the decay time scale of the noise correlation function, is dependent on the Gilbert damping constant α (for Terfenol-D, the value of α ∼ 0.1 [37]). The noise correlation function can be well fitted by R ζ (t) = R ζ (0)e −tξ cos(ω 0 t), and the corresponding power spectra is obtained as follows…”

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confidence: 99%

Hybrid sensors based on colour centres in diamond and piezoactive layers

Cai¹,

Jelezko²,

Plenio³

2014

Nat Commun

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The ability to measure weak signals such as pressure, force, electric field, and temperature with nanoscale devices and high spatial resolution offers a wide range of applications in fundamental and applied sciences. Here we present a proposal for a hybrid device composed of thin film layers of diamond with color centers implanted and piezo-active elements for the transduction and measurement of a wide variety of physical signals. The magnetic response of a piezomagnetic layer to an external stress or a stress induced by the change of electric field and temperature is shown to affect significantly the spin properties of nitrogen-vacancy centers in diamond. Under ambient conditions, realistic environmental noise and material imperfections, our detailed numerical studies show that this hybrid device can achieve significant improvements in sensitivity over the pure diamond based approach in combination with nanometer scale spatial resolution. Beyond its applications in quantum sensing the proposed hybrid architecture offers novel possibilities for engineering strong coherent couplings between nanomechanical oscillator and solid state spin qubits.Introduction.-The sensitive measurement of signals, such as force, pressure, electric field, temperature, with high spatial resolution possesses a wide range of applications in physics, engineering and the life sciences. Conventional methods, e.g. for pressure detection can usually operate at length scales down to the micron scale. Going beyond this regime whilst retaining highest sensitivity represents a significant challenge.

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Intrinsic and non-local Gilbert damping in polycrystalline nickel studied by Ti : sapphire laser fs spectroscopy

Cited by 169 publications

References 63 publications

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

Precise determination of the spectroscopic g-factor by use of broadband ferromagnetic resonance spectroscopy

Hybrid sensors based on colour centres in diamond and piezoactive layers

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