Ferromagnetic resonance in periodic particle arrays

Jung, Sungjune; Watkins, Byron; DeLong, L. E.; Ketterson, J. B.; Chandrasekhar, Venkat

doi:10.1103/physrevb.66.132401

Cited by 112 publications

(103 citation statements)

References 12 publications

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“…23, M s can be reliably determined via measurement of the quasiuniform mode frequency versus external field applied parallel to the wire axis. From these measurements we determined the saturation magnetization M s of each wire: 790 ± 1 emu/cm 3 (wire A), 785 ± 1 emu/cm 3 (wire B), 850 ± 3 emu/cm 3 (wire C), which are typical for Py thin films [59][60][61][62][63] . These values of M s together with a g-factor of 2.1 63,64 and an exchange stiffness of 1.3 µerg/cm 59,61 are used as material parameters for our analytical calculations and micromagnetic simulations.…”

Section: Resultsmentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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We report experimental and theoretical studies of spin wave eigenmodes in transversely magnetized thin film Permalloy wires. Using broadband ferromagnetic resonance technique, we measure the spectrum of spin wave eigenmodes in individual wires as a function of magnetic field and wire width. Comparison of the experimental data to our analytical model and micromagnetic simulations shows that the intrinsic dipolar edge pinning of spin waves is negligible in transversely magnetized wires. Our data also quantify the degree of extrinsic edge pinning in Permalloy wires. This work establishes the boundary conditions for dynamic magnetization in transversely magnetized thin film wires for the range of wire widths and thicknesses studied, and provides a quantitative description of the spin wave eigenmode frequencies and spatial profiles in this system as a function of the wire width.

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Section: Resultsmentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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“…Magnetization dynamics have been studied in such elements by various techniques. [1][2][3][4][5][6][7] Substantial effort has been made to study magnetization reversal in continuous films and small elements 8,9 but the coherence 10,11 of precessional switching and the origin of the damping 12,13 are the subject of continuing debate. Time-resolved magnetic images 14 show that precessional switching is incoherent even in a permalloy element that initially has uniform magnetization.…”

Section: Introductionmentioning

confidence: 99%

Imaging the dephasing of spin wave modes in a square thin film magnetic element

et al. 2004

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We have used time-resolved scanning Kerr effect microscopy to study dephasing of spin wave modes in a square Ni 81 Fe 19 element of 10 m width and 150 nm thickness. When a static magnetic field H was applied parallel to an edge of the square, demagnetized regions appeared at the edges orthogonal to the field. When H was applied along a diagonal, a demagnetized region appeared along the opposite diagonal. Time-resolved images of the out-of-plane magnetization component showed stripes that lie perpendicular to H and indicate the presence of spin wave modes with wave vector parallel to the static magnetization. The transient Kerr rotation was measured at different positions along an axis parallel to H, and the power spectra revealed a number of different modes. Micromagnetic simulations reproduce both the observed images and the mode frequencies. This study allows us to understand an anisotropic damping observed at the center of the square element in terms of dephasing of the resonant mode spectrum.

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“…By virtue of their extremely small size, these nanometer scale structures possess unique properties that differ from their parent bulk material͑s͒, [1][2][3][4] which make them potential candidates for various advanced magnetoelectronic devices. [5][6][7][8] Further device development may well depend on a better understanding of various dynamic magnetic phenomena in such nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Microwave absorption measurements using a broad-band meanderline approach

Tsai

Choi

Cho

et al. 2009

Review of Scientific Instruments

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We describe a technique that permits broad-band, field-dependent ferromagnetic and electron paramagnetic resonance absorption measurements that is applicable to thin films and patterned micro-/nanostructured arrays and is based on a wire-wound meanderline approach. Techniques to prepare meanderlines and perform microwave measurements are described along with some demonstrations involving an electron paramagnetic resonance calibration/test material, 2,2-diphenyl-1-picryl-hydrazyl, and a ferromagnetic cobalt thin film. KeywordsMicrowave, absorption, measurements, using, broad, band, meanderline, approach Microwave absorption measurements using a broad-band meanderline approach We describe a technique that permits broad-band, field-dependent ferromagnetic and electron paramagnetic resonance absorption measurements that is applicable to thin films and patterned micro-/nanostructured arrays and is based on a wire-wound meanderline approach. Techniques to prepare meanderlines and perform microwave measurements are described along with some demonstrations involving an electron paramagnetic resonance calibration/test material, 2,2-diphenyl-1-picryl-hydrazyl, and a ferromagnetic cobalt thin film.

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Ferromagnetic resonance in periodic particle arrays

Cited by 112 publications

References 12 publications

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Imaging the dephasing of spin wave modes in a square thin film magnetic element

Microwave absorption measurements using a broad-band meanderline approach

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