Gilbert damping and g-factor in FexCo1−x alloy films

Schreiber, Frank; Pflaum, Jens; Frait, Z.; Mühge, Th.; Pelzl, J.

doi:10.1016/0038-1098(94)00906-6

Cited by 132 publications

(62 citation statements)

References 20 publications

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“…22 The decrease of α with in- creasing Fe content in the concentrated NiFe alloys can be related to the increasing alloy magnetization 17 and to the decreasing strength of the SO-interaction, 20 whereas the behavior in the dilute limit can be explained by intraband scattering due to Fe impurities. 11,12,14 In the case of the FeCo system, the minimum of α around 20% Co, which is also observed in room-temperature experiments, 49,50 is related primarily to a similar concentration trend of the density of states at the Fermi energy, 22 though the maximum of the magnetization at roughly the same alloy composition 51 might partly contribute as well.…”

Section: B Binary Fcc and Bcc Solid Solutionssupporting

confidence: 52%

Nonlocal torque operators inab initiotheory of the Gilbert damping in random ferromagnetic alloys

2015

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We present an ab initio theory of the Gilbert damping in substitutionally disordered ferromagnetic alloys. The theory rests on introduced nonlocal torques which replace traditional local torque operators in the well-known torque-correlation formula and which can be formulated within the atomic-sphere approximation. The formalism is sketched in a simple tight-binding model and worked out in detail in the relativistic tight-binding linear muffin-tin orbital (TB-LMTO) method and the coherent potential approximation (CPA). The resulting nonlocal torques are represented by nonrandom, non-site-diagonal and spin-independent matrices, which simplifies the configuration averaging. The CPA-vertex corrections play a crucial role for the internal consistency of the theory and for its exact equivalence to other first-principles approaches based on the random local torques. This equivalence is also illustrated by the calculated Gilbert damping parameters for binary NiFe and FeCo random alloys, for pure iron with a model atomic-level disorder, and for stoichiometric FePt alloys with a varying degree of L10 atomic long-range order.

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Section: B Binary Fcc and Bcc Solid Solutionssupporting

confidence: 52%

Nonlocal torque operators inab initiotheory of the Gilbert damping in random ferromagnetic alloys

2015

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“…We used the value g = 2.07 for all concentrations.) The damping constants for Fe-Co thin films were reported previously 23,24) , but these data were for larger Co fractions and they cannot be compared with the present data.…”

Section: Magnetic Dampingcontrasting

confidence: 50%

Ferromagnetic Resonance Study of Fe100-xCox/GaAs(001) (x ^|^lt; 11) Deposited by RF Magnetron Sputtering

et al. 2013

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The Fe 100x Co x alloy thin films with dilute Co concentrations (x < 11) were prepared on GaAs(001) substrates by RF magnetron sputtering, and their dynamic magnetic properties were investigated by ferromagnetic resonance spectroscopy operating at Q-band (35 GHz). The magnetization curves measured by VSM show clear dependence on the in-plane field directions, indicating bcc Fe 100x Co x films were epitaxially grown on the substrates. The ferromagnetic resonance linewidths include both intrinsic and extrinsic magnetic damping. The origins of the latter were examined to extract the intrinsic damping. The estimated upper bounds of the Gilbert damping constants, caused by the intrinsic damping, depend on the Co compositions; the damping is accelerated as Co concentration increases in the region with x < 11.

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“…[3][4][5][6][7] The Patton group pioneered the use of two magnon scattering in metallic films. 8 In a wide range of metallic amorphous ribbons, 9 films, 10 and metallic ultrathin film multilayers 1,11,12 the ferromagnetic resonance ͑FMR͒ linewidth, ⌬H, above 10 GHz is not only proportional to the microwave angular frequency, , as expected from the Gilbert damping but possesses a zerofrequency offset ⌬H(0),…”

Section: Introductionmentioning

confidence: 99%

Nanosecond magnetic relaxation processes in ultrathin metallic films prepared by MBE

et al. 2001

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Magnetic relaxation processes were investigated by ferromagnetic resonance ͑FMR͒ using crystalline Cr/ Fe/GaAs͑001͒ ultrathin film structures grown by molecular beam epitaxy ͑MBE͒. For Fe films thicker than 1.5 nm the extrinsic relaxation term showed evidence of two magnon scattering. Above 10 GHz the in-plane FMR linewidth was linearly dependent on the microwave frequency with an appreciable zero-frequency offset. The zero frequency offset measures the strength of extrinsic damping. The in-plane Gilbert damping includes both the intrinsic and extrinsic Gilbert contributions in qualitative agreement with recent predictions by Arias and Mills.

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Gilbert damping and g-factor in FexCo1−x alloy films

Cited by 132 publications

References 20 publications

Nonlocal torque operators inab initiotheory of the Gilbert damping in random ferromagnetic alloys

Nonlocal torque operators inab initiotheory of the Gilbert damping in random ferromagnetic alloys

Ferromagnetic Resonance Study of Fe100-xCox/GaAs(001) (x ^|^lt; 11) Deposited by RF Magnetron Sputtering

Nanosecond magnetic relaxation processes in ultrathin metallic films prepared by MBE

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