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  • 1
    Electronic Resource
    Electronic Resource
    Erratum: Improvement of sensitivity of the vibrating reed magnetometer [Rev. Sci. Instrum. 59, 1388 (1988)] (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3569-3569 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141093
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  • 2
    Electronic Resource
    Electronic Resource
    Improvement of sensitivity of the vibrating reed magnetometer (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1388-1393 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A very-high-sensitivity magnetometer is described in detail. The sensitivity of the apparatus is typically of the order of 10−9 A cm2/(Hz)1/2, so that changes in magnetic moment of 10−10 A cm2 can be detected. The magnetic moment can be calculated by simulation of the measurement system. An example of a hysteresis loop is shown. The size of the sample is determined by electron microscopy. The physical limits of the measurement system are worked out and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139674
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  • 3
    Electronic Resource
    Electronic Resource
    Transverse susceptibility and magnetic anisotropy of CoTi-doped barium hexaferrite single crystals : 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. 6062-6064 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the reversible transverse susceptibility (RTS) were performed on BaFe12−x−yCoxTiyO19 single crystals with doping concentrations x≈y≤0.77 under different angles cursive-theta0 between the easy axis and applied field. For intermediate doping concentrations the occurrence of a peak in the RTS curve for cursive-theta0=90° indicates that the domain walls are not free to move. This assumption is confirmed further by the large component of the RTS being out of phase with respect to the excitation field HE. The phase angle of the initial susceptibility measured parallel to the easy axis becomes maximum at a characteristic excitation field value HE,C and a relaxation of the susceptibility is observed if HE steps from zero to a value larger than HE,C. Using the RTS curve for cursive-theta0=0 and assuming that the peak of the RTS is located at the same field strength as if the particle were single domain, the first-order anisotropy field HA=2K1/(μ0Ms) and the second-order anisotropy constant K2 can be determined. The values found this way are compared to results from magnetization-curve analysis and from other authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358366
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  • 4
    Electronic Resource
    Electronic Resource
    Transverse susceptibility and ferromagnetic resonance of Hi-8 metal-evaporated tape : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5981-5983 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transverse susceptibility (TS) and ferromagnetic resonance absorption (FMR) are measured on commercially available metal-evaporated video tape manufactured by the continuous varying incidence method, so that the columns are inclined at an angle cursive-thetaint with respect to the recording direction. Due to the demagnetization of the tape the magnetization vector is at an extrinsic inclination angle cursive-thetaext〈cursive-thetaint with respect to the recording direction, which is determined to be 24° by analyzing angular remanence curves. The results of TS and FMR measurements on the dependence of the angle cursive-thetaN between applied field and tape normal are symmetrical to cursive-thetaN=cursive-thetaext. In-plane TS measurements parallel and perpendicular to the recording direction lead to HA=440 kA/m and an intrinsic inclination angle cursive-thetaint=44°. Using these values, measured and calculated resonance field values Hres are in good agreement except for 0°〈cursive-thetaN〈50°. The analysis of Hres in the vicinity of cursive-thetaN=24° leads to HA=640 kA/m and cursive-thetaint=37°. Thus, Stoner–Wohlfarth behavior with lower anisotropy field strength as determined perpendicular to the preferential axis of magnetization is suggested. In contrast to TS measurements, no results can be found that fit the resonance field value both parallel and perpendicular to the film normal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355532
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum: Transverse susceptibility and ferromagnetic resonance of HI-8 metal evaporated tape [J. Appl. Phys. 75, 5981 (1994)] (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3550-3550 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360784
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  • 6
    Electronic Resource
    Electronic Resource
    Anisotropy of grain-oriented steel sheet under various elliptical field conditions : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6268-6270 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigated the magnetic behavior of grain-oriented steel sheet under various elliptical field conditions. The measurements show an additional anisotropy of the material properties depending on the direction of the elliptic rotation. We ascribe these phenomena to the different symmetries of the crystal anisotropy energy and of the ellipsoidal fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349988
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of angular dependence of the critical field of barium ferrite from remanence and microwave measurements (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6000-6000 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution of the critical field of nontextured polycrystalline ferrite is determined. Barium ferrite samples are saturated in one direction and measured with a field H applied at an angle θ to the saturation field. The measured quantities are the remanent magnetization and the microwave hysteresis including minor loops. Especially the microwave absorption curves allow direct analysis of the critical field as a function of the orientation angle cursive-theta0 between H and the easy axis. Starting with these data a fit of the calculated to the measured remanence curves yield the distribution. The figure shows the critical field distribution of a ferrite sample with large coercivity. Additionally the calculated and measured resonance fields ares are given. All field strengths are normalized to the anisotropy field, which can also be determined from the microwave measurement.1
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342130
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  • 8
    Electronic Resource
    Electronic Resource
    Investigations of magnetic hysteresis of barium ferrite using the torsion pendulum method (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5980-5982 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic stiffness is measured by the torsion pendulum method as a function of the applied field. Measurements are performed on random assemblies of chemically coprecipitated barium ferrite powders. The magnetic stiffness for both minor and major loops of the hysteresis cycle is measured and compared with calculated curves based on the model of coherent rotation. The discrepancies between theory and experiment are partly due to the effect of magnetic interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342169
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  • 9
    Electronic Resource
    Electronic Resource
    Interaction effects in particulate recording media studied by ferromagnetic resonance (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3426-3429 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: According to the Stoner–Wohlfarth theory, ferromagnetic resonance (FMR) experiments along minor loops of the hysteresis should deliver the same microwave absorption loss for vanishing applied field independent of the remanence state of a polycrystalline sample. In the present work, deviations from that prediction in particulate recording media are presented, and a strong connection of zero-field absorption and remanence magnetization of the sample, as well as the introduction of an experimental procedure to determine the interaction field with an application on differently substituted hexaferrites is shown. Additionally, the mean-field ansatz is verified to be a valid model in order to describe the influence of magnetostatic interaction in multi-particle systems. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363210
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  • 10
    Electronic Resource
    Electronic Resource
    Formation and microwave absorption of barium and strontium ferrite prepared by sol-gel technique (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2836-2838 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ba and Sr ferrites are prepared by sol-gel technique with different Fe/Ba(Sr) ratios in the starting materials. Magnetization, coercive, and anisotropy field strength are determined depending on the heat treatment of the gel and the iron/barium(strontium) ratio in the starting material. A two-step heat treatment is used to prepare single-domain powders with high magnetization. These powders prepared by sol-gel technique show single-domain behavior with specific magnetization σS=649 A cm2/g and coercive field strength HcM=402 kA/m in the case of Ba ferrite and σS=695 A cm2/g and HcM=416 kA/m for Sr the ferrite. Al-substituted ferrites with high anisotropy field strengths are prepared additionally. Ferromagnetic resonance absorption is used to determine the anisotropy field strength and to investigate the formation process of the hexaferrite phase during the heat treatment. The beginning of hexaferrite formation occurs at annealing temperatures below 700 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110303
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