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Determination of angular dependence of the critical field of barium ferrite from remanence and microwave measurements (abstract) (1988)

Schumacher, F. ; Hempel, K. A. ; von Staa, F.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 6000-6000

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: 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

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.342130

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Digitale Medien

Investigations of magnetic hysteresis of barium ferrite using the torsion pendulum method (1988)

Richter, H. J. ; Hempel, K. A.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 5980-5982

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.342169

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Digitale Medien

Improvement of sensitivity of the vibrating reed magnetometer (1988)

Richter, H. J. ; Hempel, K. A. ; Pfeiffer, J.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 59 (1988), S. 1388-1393

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1139674

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