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  • 1
    Electronic Resource
    Electronic Resource
    Thermal effects in magnetization, anisotropy, and interface width in Fe/Cu multilayers (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6266-6266 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties of Fe/Cu multilayers have been investigated as a function of temperature using dc magnetization and ferromagnetic resonance techniques. The samples were prepared via dc sputtering resulting in equal thickness elemental layers ranging in modulation wavelength from 1 to 30 nm. The interface anisotropy remains nearly constant at 0.32 erg/cm2 through the 4–300 K temperature range, which is in stark contrast to large thermal effects observed in Ni-based systems. Relative increases in magnetization with decreasing temperature range from 3% in the 30 nm sample to 27% in the 1.0 nm sample. This indicates an interface region in which the magnetization is more strongly temperature dependent than the interior of an Fe layer. By plotting magnetization as a function of the inverse layer thickness, we obtain the temperature dependence of the width of this interfacial region. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362031
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic profile as a function of structural disorder in Fe/Cr superlattices : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6178-6180 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural disorder has been systematically introduced in an [Fe(30 A(ring))/Cr(17 A(ring))]10 superlattice to investigate its effects on the magnetization profile. Low angle x-ray and neutron scattering results indicate progressive structural degradation in samples produced with increased argon pressure (3, 6, and 12 mTorr). The x-ray spectra from the more disordered samples are characterized by a decreased intensity and increased linewidth of the superlattice Bragg peaks, along with a systematic disappearance of the finite size intensity oscillations. Elastic, polarized, low angle, neutron reflectivity data exhibit decreasing superlattice Bragg intensities and increasing linewidths, indicating increased disorder in agreement with x-ray data. Antiferromagnetic alignment of adjacent Fe layers is inferred by the appearance of magnetic peaks between the structural peaks and by the lack of magnetic contribution to the structural superlattice peaks. Interestingly, the magnetic superlattice peak does not exhibit appreciable degradation with increasing disorder in the structure, indicating a magnetic coherence length significantly greater than that of the chemical superlattice structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355448
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of magnetic multilayer anisotropy using an ultralow-compliance-torque magnetometer : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5085-5087 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A torque magnetometer has been designed to make measurements with 0.01-dyn cm resolution. The system was constructed with a Cambridge Technologies 20-nm/dyn-force transducer and was calibrated with a current-carrying coil. A novel analysis technique is presented to determine anisotropy constants in thin-film samples at fields much less than the material's saturating field. Results from a Fe/Cu multilayer sample are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348131
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  • 4
    Electronic Resource
    Electronic Resource
    Frequency dependence of magnetic anisotropy in Ni/Mo multilayers (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5684-5684 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based upon earlier findings,1 an investigation of frequency-dependent effects in interface anisotropy has been undertaken, preliminary results of which are presented. Six equal-layer-thickness Ni/Mo multilayer samples ranging in Ni layer thickness d from 20 to 1000 A(ring) were measured in the parallel geometry by 4, 9, 18, and 36 GHz ferromagnetic resonance at room temperature. The total anisotropy decreases with decreasing frequency for small d samples and increases with decreasing frequency for large d samples, thereby establishing the existence of frequency dependence. Measurements at low temperature, where the interface anisotropy (IA) is much more pronounced, are underway to investigate the IA frequency dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345929
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  • 5
    Electronic Resource
    Electronic Resource
    Automatic frequency control for solid-state sources in electron spin resonance (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3666-3669 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A lock-in amplifier circuit has been designed and tested which serves as an automatic frequency control (AFC) for electron spin resonance (ESR) spectrometers employing solid-state microwave generators. Its implementation in a typical spectrometer is described and a detailed electronic schematic presented. Its performance is tested as a lock-in amplifier operating under open loop conditions, wherein operating with a 20-kHz reference, it yields an 81-dB improvement in signal to (9 kHz) noise ratio. This is consistent with expectations from computer simulations. When employed as an AFC in a typical X-band ESR system the capture and lock ranges are observed to be equivalent to those obtained from a commercial lock-in amplifier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143595
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  • 6
    Electronic Resource
    Electronic Resource
    Variable temperature ultralow compliance torque magnetometer (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 802-805 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design and implementation of a variable temperature, easily automated torque magnetometer is described which utilizes a commercial capacitive-based transducer system. Absolute calibration is accomplished with a current-carrying coil and the constant is found to be temperature independent to within ±0.5% over the cryogenic to room temperature range measured. Linearity is observed in all signal levels measured, ranging over four orders of magnitude, from 0.003 to 50 dyn cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144162
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy and interlayer coupling in Fe0.5Co0.5(100) films on GaAs(100) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7514-7516 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial Fe0.5Co0.5(100) films have been grown via MBE on GaAs (100) at reduced temperatures in order to minimize interfacial reactions. In-plane magnetization measurements reveal an overall twofold anisotropy superimposed with a fourfold component. Ferromagnetic resonance (FMR) measurements as a function of in-plane angle confirmed the mixed anisotropy state and provided energy densities of −2.4×105 erg/cm3 and −2.2×105 erg/cm3 for the twofold and fourfold terms, respectively. Two FeCo/InAs/FeCo trilayer samples were prepared to examine interlayer coupling effects. The samples differed in growth temperature (95 °C and 150 °C) of the InAs layer. FMR shows evidence for interlayer coupling in the 95 °C, but not the 150 °C sample. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1354592
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  • 8
    Electronic Resource
    Electronic Resource
    Anisotropy determination in epitaxial Sm–Co/Fe exchange springs (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6686-6688 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report in-plane anisotropy in epitaxial Sm–Co(x)/Fe(y) bilayers as determined by ferromagnetic resonance (FMR). Four samples, (x,y)=(35,30) and (20, 20) nm each on MgO (110) and (100) substrates, have been prepared via magnetron sputtering. The two substrate orientations result in twofold and fourfold Sm–Co symmetry respectively, with the Sm–Co c-axis in-plane. Magnetization curves indicate elastic exchange spring Fe behavior in reversing fields up to the Sm–Co switching fields (6 and 8 kG at room temperature in the (35, 30) and (20, 20) nm films, respectively). 35 GHz in-plane FMR measurements were made in order to map the crystalline anisotropy of the Fe layer as well as the induced anisotropy from the exchange coupling to the Sm–Co layer. The twofold Sm–Co samples exhibit a clear superposition of the near fourfold Fe crystal field anisotropy (530 Oe) and the unidirectional exchange-bias anisotropy ((approximate)650 Oe) arising from the Fe/Sm–Co interface. The crystalline Fe anisotropy in the fourfold Sm–Co samples is less well defined, presumably due to poorer epitaxy of the Fe layer for this orientation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372808
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature dependence of interface anisotropy in Ni/Mo multilayers (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5754-5756 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Equal layer thickness Ni/Mo multilayer samples ranging in Ni layer thickness d from 14 to 340 A(ring) have been investigated by x-band ferromagnetic resonance at temperatures between 4 and 293 K. The dependence of anisotropy (less demagnetization) Ha upon d clearly indicates the interface anisotropy plays a significant role in these samples. Interface (Ks) and volume (Kv) contributions to the anisotropy are extracted at each temperature using an approximate form of Ha=2(Kv+2Ks/d)/M. The Ks temperature dependence is shown to be inconsistent with a simple mean field model and indicates that interface strain due to the Ni-Mo lattice mismatch is largely responsible for the origin of Ks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342248
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  • 10
    Electronic Resource
    Electronic Resource
    Orientation-dependent relaxation in spin glass Cu2MnAl (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4083-4085 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron spin resonance measurements have been performed as a function of temperature, cooling field, and sample orientation on the amorphous spin-glass system Cu2MnAl (Tg=65 K). The peak in the linewidth (Γ) does not occur until T≈25 K which is shown to result from the reduction of the transition temperature in an applied field. The linewidth for the applied field parallel to the film surface is much greater than if the applied field is perpendicular to the film surface. This anomalous orientation dependence of Γ is not well understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338535
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