Ferromagnetic resonance and surface anisotropy in iron single crystals

Frait, Z.; Fraítová, D.

doi:10.1016/0304-8853(80)90895-1

Cited by 56 publications

(10 citation statements)

References 7 publications

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“…The measured values of the effective damping constant a Ã are almost two times bigger than the intrinsic value a expected for bulk Fe [24]. The contribution from magnetic inhomogeneities to the effective damping parameter can be deduced from a decay of a Ã as a function of bias field [25].…”

Section: Magnetic Relaxationmentioning

confidence: 73%

Comparison of frequency, field, and time domain ferromagnetic resonance methods

Neudecker¹,

Woltersdorf²,

Heinrich³

et al. 2006

Journal of Magnetism and Magnetic Materials

131

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We present vector network analyzer ferromagnetic resonance measurements of epitaxial Fe films having a thickness of 16 monolayers. Our objective is to test the reliability of this novel frequency domain technique with respect to frequency and damping. For this purpose we compare vector network analyzer ferromagnetic resonance to pulsed inductive microwave magnetometry, time resolved magnetooptic Kerr effect (both methods in the time domain), and conventional ferromagnetic resonance (measured in the field domain) in terms of position and width of the ferromagnetic resonance. In addition, we compare the various techniques with respect to the signal to noise ratio of the raw data. All data is obtained using the same well characterized ultrathin magnetic Fe/GaAs (0 0 1) film. Finally, we demonstrate the potential of the vector network analyzer ferromagnetic resonance technique for the investigation of nano-structured magnetic elements having nonuniform magnetization configuration. The absorption spectrum of Permalloy disks with a diameter of 200 nm and a thickness of 15 nm shows up to eight distinct resonance peaks. The spatial structure of the corresponding modes was derived from numerical calculations and reveals that azimuthal modes up to the fifth order have been observed inductively. r

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Section: Magnetic Relaxationmentioning

confidence: 73%

Comparison of frequency, field, and time domain ferromagnetic resonance methods

Neudecker¹,

Woltersdorf²,

Heinrich³

et al. 2006

Journal of Magnetism and Magnetic Materials

131

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“…The resulting effective field has a Gilbert like form with the effective Gilbert damping, (in Gauss's units) (6) where is the electrical conductivity and is the velocity of light in free space. For Fe, the measured intrinsic Gilbert damping parameter is s [6], [7]. The effective eddy current Gilbert parameter becomes comparable to the intrinsic damping in Fe for a film thickness of 40 nm.…”

Section: A Eddy Currentsmentioning

confidence: 68%

Magnetic relaxations in metallic multilayers

2002

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Abstract-The intrinsic damping mechanism in metals caused by incoherent scattering of itinerant electron-hole pair excitations by phonons and magnons will be reviewed. The unique features of magnetic relaxations in multilayers were studied by ferromagnetic resonance (FMR) using magnetic single, Au-Fe-GaAs(001), and double layer Au-Fe-Au-Fe-GaAs(001) structures prepared by molecular beam epitaxy. The magnetic relaxation in single-layer films is described by the Gilbert damping with no extrinsic contributions to the FMR linewidth. These films provided an excellent opportunity to investigate nonlocal damping. The main result of these studies is that ultrathin Fe films in magnetic double layers acquire an additional interface Gilbert damping. This is in agreement with recent predictions of nonlocal interface damping which is based on the transport of spin angular momentum between the ferromagnetic layers. Measurements of the nonlocal Gilbert damping offer a possibility to carry out quantitative studies of the relaxation torques caused by nonlocal spin momentum transfer. Numerical simulations of magnetization reversal and stationary precession for an applied perpendicular current in Au-Fe-Au-Fe-GaAs(001) multilayers will be shown.Index Terms-Ferromagnetic resonance, magnetic multilayers, nonlocal spin relaxations.

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“…Sputtered films, in fact, are thought to have low G due to a smaller density of point defects due to higher adatom energy, but suffer from high ∆H 0 from line defects. 1 Inhomogeneous losses have been reduced all the way to zero in MBE deposited Fe, but with relatively high G > 140 Mhz [8] We have found that there are three critical issues for high quality epitaxial UHV sputtered films. Temperature must exceed 200 C. The cap layer is extremely important; our best results have been with Ti or Au caps.…”

Section: Discussionmentioning

confidence: 96%

“…G is an essential parameter for microwave applications. Lowest values have been found in the past for pure iron (Fe), with G to 57 Mhz [1,2], although a range of G from 57 to 140 Mhz is cited typically in Fe [3].…”

Section: Previous Work Of Pimentioning

confidence: 99%

MBE Deposition of Epitaxial Fe1-xVx Films for Low-Loss Ghz Devices; Atomic-Scale Engineering of Magnetic Dynamics

Bailey¹

2006

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Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. AbstractWe report on the deposition of epitaxial iron and iron alloy thin films with the lowest GHz linewidths ever attained in metallic ferromagnets. Maximum halfpower Q is shown of 100 at 10 Ghz and 140 at 40 Ghz, significantly higher than known previously for metals.

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Ferromagnetic resonance and surface anisotropy in iron single crystals

Cited by 56 publications

References 7 publications

Comparison of frequency, field, and time domain ferromagnetic resonance methods

Comparison of frequency, field, and time domain ferromagnetic resonance methods

Magnetic relaxations in metallic multilayers

MBE Deposition of Epitaxial Fe1-xVx Films for Low-Loss Ghz Devices; Atomic-Scale Engineering of Magnetic Dynamics

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