Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Exchange coupled domain walls: Resonance in multilayers : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5370-5372 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exchange coupling between magnetic films can lead to an attractive force between domain walls in the separate films. The coupling between the films allows for small amplitude oscillations around the equilibrium configuration of the walls, analogous to optic and acoustic type spin wave resonance modes. Since the restoring force acts only over the length of a domain wall, this suggests the possibility of sensitive measurements of the local coupling by studying domain wall resonances. The effects of applied fields are also examined. With antiferromagnetic coupling, small static fields push the walls apart and result in different behaviors of the acoustic and optic domain wall resonances. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364600
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Synchronization of chaos in circular yttrium iron garnet films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5378-5380 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of the synchronization of two ferromagnetic resonance signals are presented. In the experiment, a thin yttrium iron garnet (YIG) film was placed in the perpendicular resonance configuration and the bias field, rf power, and frequency were chosen so that the rf absorption of the YIG sample was chaotic. A segment of this chaotic signal was stored into memory. The goal was to induce the sample to synchronize to its prerecorded output through a perturbation applied to a system parameter. The results of these synchronization experiments were predicted by a numerical model. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362309
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effects of oxygen vacancies on magnetic properties of Ca-substituted yttrium iron garnet (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5740-5740 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ca-substituted YIG samples, Y3−xCaxFe5O12−0.5x−z for 0.14≤x≤0.23 were annealed for 6–8 h at various temperatures between 600 °C and 1000 °C in N2 atmosphere. The magnetization barely shows any change by annealing under 900 °C but by annealing between 900 °C and 1000 °C a significant change over the temperature range from 4.2 K to the Curie temperature is observed. The lattice constant is also observed to change. The magnetization and the lattice constant of the samples did not change within experimental error by annealing in O2 atmosphere at 1000 °C. For the sample with x=0.23, annealing at 1000 °C in N2 resulted in a decrease of 4πM at 4.2 K by 560 G and a decrease of the lattice constant by 0.031 A(ring). The Curie temperature also changes from 531 K in the as-grown sample to 508 K for this annealing condition. The change in 4πM for various annealing conditions is linear with the change in the lattice constant. For the samples tested, the oxygen vacancies, z, in the as-grown state shows z(approximately-greater-than)0 and that z did not change by annealing in O2 atmosphere. A microscopic molecular field model based on the Heisenberg Hamiltonian in which a singly charged oxygen vacancy, VO(overdot), mediates a ferromagnetic superexchange between the iron ions at adjacent sites is proposed. The model explains the temperature dependence of 4πM, the magnitude of superexchange constant mediated by VO(overdot) and the variation of the Curie temperature with annealing conditions. This model also explains the positive slope of 4πM at low temperature for Ca-substituted YIG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355600
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Thickness dependence of auto oscillations in circular yttrium-iron-garnet films : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5731-5733 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using high-power ferromagnetic resonance the dependence of the auto-oscillation frequency has been investigated as a function of the thickness of thin circular yttrium-iron-garnet films. For thicknesses over the range from 0.5 to 1.4 μm, the auto-oscillation frequencies are found to be directly proportional to the thickness of the films, even though the linewidth remains nearly unchanged over this range. These results indicate that the auto-oscillation frequency is determined by a magnetostatic mode spacing. The experimental results are compared with numerical calculations, based on a microscopic Hamiltonian and show good agreement (within 10% for first finger) with the experimental data. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364651
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Effects of high-temperature annealing on the optical absorption of Ca:YIG films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5191-5192 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of high-temperature annealing on the optical properties of a calcium doped yttrium iron garnet (Ca:YIG) film were studied. The optical absorption was examined for a film of Ca0.18:YIG reduced in an atmosphere of N2 at temperatures above 900 °C. During the annealing, the optical absorption initially decreased below the as-grown value as expected, but subsequently increased to a value greater than that for the as-grown film as the annealing temperatures were increased. The changes observed in the optical absorption are believed to be due to the introduction of oxygen vacancies in the film as a result of the annealing. Initially, the added oxygen vacancies simply compensate the Ca2+, while successive annealings introduce excess vacancies which lead to a new absorption mechanism. The results of this study and the expected mechanism for the effect are reported. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361335
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Interlayer exchange coupling versus ferromagnetic layer thickness in asymmetric Co/Ru/Co trilayer films : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7078-7080 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dependence of the interlayer exchange coupling coefficient A12 on the Co layer thickness has been observed in asymmetric Co(32 A(ring))/Ru(tRu)/Co(t2) trilayer structures for several series within which tRu is a constant. As a function of the second Co layer thickness, the amplitude of A12 varies significantly but the sign of A12 does not change within each series. In both parallel and antiparallel coupled structures, the variation length Δt2 between the maximum and the minimum coupling strength is rather large (about 10 A(ring)) and consistent from series to series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358033
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Controlling high frequency chaos in circular YIG films : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6886-6888 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High power ferromagnetic resonance experiments involving thin circular YIG films produce chaotic oscillations with broad band frequency spectra in the 0.5–25 MHz range. To eliminate chaotic oscillations, a delayed feedback of the ac component of the ferromagnetic resonance signal was used to modulate one of the system parameters, the applied static magnetic field. The chaotic oscillations were converted to oscillations of reduced periodicity, and ultimately the quiescent state, as the gain in the feedback loop was increased. Similar results have been obtained in numerical simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358101
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Chaos in magnetic garnet thin films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4157-4159 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferromagnetic resonance in thin magnetic garnet films has been studied at excitation frequencies of 10 GHz and from room temperature to 4.2 K. Powers sufficient to drive the magnetization to large precession angles have been studied. Second-order Suhl instabilities of the main resonance have been observed as an onset of auto-oscillations of the magnetization. These oscillations include regular and irregular oscillations, very noisy collective oscillations, as well as spiking. They have been observed in real time and by spectral analysis. In pure yttrium iron garnet (YIG) films the oscillations have been observed in the frequency range from 0.5 to 2 MHz at 300 and 4.2 K. In going from 300 to 4.2 K the threshold power level pth in YIG films is lowered by three orders of magnitude, while the frequency of the regular oscillations are nearly independent of temperature. If pth is connected to the intrinsic damping parameter γ, then γ is temperature dependent, which is in fair agreement with the large number of narrow resonance features observed in the films. Preliminary simulations using a model extending the S theory of Zakharov and Nakamura for large precession angles give time evolutions that are qualitatively similar to the experimental observations. Regular and weekly irregular oscillations are found for one spin-wave mode coupled to a linear resonance circuit, i.e., a phonon mode. More irregularity is found for two coupled spin-wave modes excited to large precession angles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340525
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Bifurcation to chaos in auto-oscillations in circular yttrium-ion-garnet films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4521-4523 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: One of the most intriguing features of any nonlinear system is its dynamic evolution. Starting from the steady state the system evolves to a linear periodic motion and then experiences a series of "phase transitions" known as bifurcation which lead to a final chaotic state. In order to better understand the nonlinear behavior in magnetic systems, an experimental and numerical study of bifurcation to chaos in auto-oscillations at ferromagnetic resonance is presented. Experiments have been performed with thin circular iron garnet films using perpendicular high-power ferromagnetic resonance. Taking the magnetic field as a variable parameter the bifurcation route to chaos has been investigated. The system has been modeled by the usual three magnetostatic mode interaction model derived from the macroscopic Hamiltonian. Along with the modeled signal, the time dependence of the complex Lyapunov exponent has been investigated for the three magnetostatic modes. The possibilities for controlling chaos with periodic perturbation have been studied and the reason for desynchronization bursts is discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370395
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Canted ferrimagnetism in Ca2+Sc3+ substituted yttrium-iron-garnet (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5656-5658 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the magnetization of Y3−y−zCayLuzFe5−xScxO12 (0.6≤x≤1.2, 0≤y≤0.3, 0≤z≤0.9) epitaxial garnet films was measured from 4.2 K up to the Curie temperature. For x=0.7 and T≥50 K, 4πMs is enhanced by about 10% compared to the magnetization of Sc0.7 YIG. At T〈50 K, a reduction of the magnetization, increasing with increasing substitution, was observed for all the measured samples. Agreement between the experimental results and molecular field models was obtained by taking into account the canting of the unsubstituted sublattice, the presence of charge compensating Fe4+ ions, a low-temperature ordering of Fe3+ ions with less than two magnetic nearest neighbors, and assuming a lattice parameter-dependent exchange interaction ratio with d(Jdd/Jad)/da =28 nm.−1 For x=1.2 and T〈10 K the magnetization can be influenced by cooling through the Curie point in a magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342261
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...