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  • Electronic Resource  (31)
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  • Electronic Resource  (31)
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  • 1
    Electronic Resource
    Electronic Resource
    Ferromagnetic resonance in Ag coupled Ni films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6341-6343 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an X-band ferromagnetic resonance (FMR) study of polycrystalline single Ni films and of two Ni layers separated by an Ag layer at room temperature. Films were deposited by sputtering on glass using Ag over- and underlays. The single Ni films have a FMR mode with a dependence of the resonance field on the angle α between the magnetic field and the plane in good agreement with theory. In samples with two Ni films coupled through an intervenient Ag layer, only one FMR mode is observed if the two Ni have identical thicknesses. When the films have different thicknesses a second weak resonance appears. The field difference between the two modes is a measure of the coupling between the Ni films. Results were obtained for a series of samples with the Ag thickness varying in the range 10≤t≤30 A(ring). Surprisingly, the two modes have opposite behavior with the variation of α, for all values of t. The results suggest that the coupling is antiferromagnetic when the field is parallel to the film plane and ferromagnetic when perpendicular, regardless of t.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352642
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  • 2
    Electronic Resource
    Electronic Resource
    Spin-wave self-oscillations: Experimental verification of the two-mode origin (invited) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6805-6810 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Most theoretical models used to explain self-oscillations and chaotic phenomena observed in microwave pumped spin-wave instabilities are based on the assumption that the dynamics is governed by a few interacting modes. This assumption is somewhat disturbing because it is known that in principle an extremely large number of modes can be excited when the microwave field h exceeds the Suhl instability threshold hc. In this paper we describe pulsed microwave (8.2 GHz) spin-wave pumping experiments in spheres and films of yttrium–iron–garnet which clearly demonstrate that, with increasing power, one mode is excited at h=hc, a second mode appears at h(approximately-greater-than)hc, and subsequently the self-oscillation sets in. The observations agree very well with computer results for the transient behavior of the spin-wave equations, showing that the two-mode assumption for the onset of self-oscillation is correct. We also present data for films which add evidence to the sample-size dependence of the self-oscillation frequency and support recent improvements proposed for the two-mode model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352492
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  • 3
    Electronic Resource
    Electronic Resource
    Spin-glass behavior in the Al:Mn quasicrystalline alloys (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5150-5150 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Despite the large manganese concentration present in the quasicrystalline Al:Mn system (typically of the order of 20%), only a small fraction of unusually large magnetic moments are detected.1 Recently2 we performed a scaling analysis of the nonlinear magnetic susceptibility of the decagonal T-Al78Mn22 quasicrystalline alloy. The critical exponents obtained (β=0.6 and γ=4.4) are identical to those obtained for canonical spin glasses.3 In this work, we present new scaling results for the icosahedral I-Al80Mn20 alloy. A discussion on the dynamical scaling of the quasicrystalline alloys is also presented.〈ks〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348108
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  • 4
    Electronic Resource
    Electronic Resource
    Irreversibility line in the ferromagnet Co70.4Fe4.6Si15B10 alloy : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6169-6171 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report magnetization measurements in the zero magnetostriction Co70.4Fe4.6Si15B10 amorphous alloy. The measurements were carried out from room temperature up to 430 °C and for applied magnetic fields up to 45 Oe. An irreversible behavior in the zero-field and field-cooled magnetization was observed. The irreversibility line was fitted to a de Almeida–Thouless line with a crossover critical exponent φ=4.66. The experimental results are analyzed in the framework of an extended random anisotropy model for amorphous ferromagnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350033
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  • 5
    Electronic Resource
    Electronic Resource
    Organizing centers of bifurcations in spin-wave instabilities (invited) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5430-5435 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an experimental and theoretical study of bifurcations leading to self-oscillations in spin-wave instabilities pumped by microwave fields. Experiments done with bulk samples of yttrium iron garnet pumped by X-band microwave radiation reveal a variety of bifurcations and routes to chaos, depending on the experimental parameters. Generally, the frequency of the self-oscillation shows a definite dependence on sample size not predicted by the existing models. On the theoretical side we show that the usual equations describing two interacting spin-wave modes predict various types of bifurcations, depending on the set of parameters. In particular, we investigate Hopf bifurcations and homoclinic phenomena. We also indicate how the spin-wave equations can be modified to predict a sample-size dependence for the self-oscillation frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348001
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  • 6
    Electronic Resource
    Electronic Resource
    Spin-wave auto-oscillations still in need of a good model (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5624-5626 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The onset of spin-wave auto-oscillations has been studied in spheres of yttrium iron garnet pumped by a microwave field parallel or perpendicular to the dc field. Data were taken for the auto-oscillation threshold field, amplitude, and frequency as a function of sample dimension, shape, and the spin-wave relaxation rate and wave vector. The behavior near the onset confirms the theoretical prediction that the auto-oscillation results from a Hopf bifurcation. However, data for the auto-oscillation frequency and threshold field are in clear disagreement with predictions. These results indicate that although the area of nonlinear spin-wave phenomena has been under investigation for over 30 years, a good model is still needed for the auto-oscillations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345906
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of spin-wave dynamics near homoclinic orbits through one-dimensional mapping (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6917-6919 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A description is given of pulsed high-power ferromagnetic resonance experiments in a YIG sphere at room temperature. Beyond the Suhl instability threshold, evidences were found for the alternating periodic-chaotic sequence. The chaotic spin-wave self-oscillations were characterized through return maps obtained from the local maxima in the observed transient-free time series. As a result, a simple one-dimensional mapping scheme that exhibits the basic features of the observed transition is presented. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372885
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  • 8
    Electronic Resource
    Electronic Resource
    Observation of mixed-mode oscillations in spin-wave experiments (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5086-5087 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-power ferromagnetic resonance experiments in a 1-mm-diam yttrium iron garnet sphere, driven at 8.9 GHz at room temperature, reveal evidence for a universal scenario not yet observed in this system, namely, the periodic–chaotic sequence. Well above the first-order Suhl instability threshold (P/PC∼6 dB), low-frequency (f∼200 kHz) auto-oscillations consisting of large-amplitude peaks followed by n small undulations (mixed-mode oscillations) have been observed. Both periodic and aperiodic trajectories were detected with n=1, 2, 3, and 4, which are reminiscent of the so-called homoclinic chaos. A discussion is made on the basis of a standard two-mode model. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370098
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  • 9
    Electronic Resource
    Electronic Resource
    Measurements of exchange anisotropy in NiFe/NiO films with different techniques (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6421-6423 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: One of the puzzles of the recent investigations on the exchange anisotropy in ferromagnetic (FM)/antiferromagnetic (AF) bilayers is the fact that different techniques yield different values for the exchange field (HE) between the layers. We report an investigation on sputtered NiFe/NiO carried out with three different techniques, namely, magneto-optical Kerr effect magnetometry (MOKE), Brillouin light scattering (BLS), and ferromagnetic resonance (FMR). In an attempt to reconcile the measurements obtained with the various techniques, we interpret the data with a model that includes the formation of a planar domain wall in the AF layer, giving rise to a torque on the FM moment represented by an effective domain wall field (HW). We find out that while the same pair of values of HE and HW provide equally good fits to the reversible FMR and BLS measurements, different pairs are necessary to fit the irreversible magnetometry data. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372725
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  • 10
    Electronic Resource
    Electronic Resource
    Giant transversal magnetoimpedance and Hall-effect measurements in Co70.4Fe4.6Si15B10 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6555-6557 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report room-temperature transversal magnetoimpedance (TMI) and Hall-effect measurements performed in ribbons of the zero-magnetostriction soft-ferromagnet Co70.4Fe4.6Si15B10 alloy annealed at 587 K for 15 min at a dc magnetic field of 2 kOe. The annealing showed little effect on the magnetostriction of the samples. The frequency f and the amplitude Iac of the current used in the measurements, and the measuring magnetic field H were varied in the intervals 10≤f≤105 Hz, 2.5≤Iac≤25 mA, and −15≤H≤15 kOe, respectively. The magnetic field dependence of the TMI shows a peak which is strongly dependent on f and on Iac. It reaches the giant value of 28% at H=350 Oe for f=100 kHz and Iac=25 mA. This TMI giant value is of the same order of the giant longitudinal magnetoimpedance (GLMI) but its peak is positioned in a magnetic field two orders of magnitude larger than the value obtained for the GLMI. The Hall effect yielded a value of RS=0.43 μΩ cm kOe−1. Peaks which are also frequency dependent were observed at the Hall voltage. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362443
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