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15 May 2003

Volume 93, Issue 10, pp. 5855-8792

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Comparison of methods for the determination of dc-magnetic properties of laminated SiFe alloys

Marc De Wulf, Dimitre Makaveev, Luc Dupré, Viatcheslav Permiakov, and Jan Melkebeek

J. Appl. Phys. 93, 8543 (2003); http://dx.doi.org/10.1063/1.1557851 (3 pages) | Cited 5 times

Online Publication Date: 9 May 2003

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A comparative study was performed of the different techniques for determination of dc-magnetic properties of laminated SiFe alloys. Three characterization methods are considered: (1) the point-by-point method (PbPM) for the construction of magnetization loops; (2) the slow time-varying excitation in which a low-frequent periodic magnetic field excitation is used; and (3) fitting of the dc properties based on the statistical power loss model of Bertotti. All experiments are performed on the Epstein frame using the same excitation source and the same electronic flux integrator. Both grain-oriented, in both the rolling direction (RD) and transverse direction (TD), and non-oriented (NO-RD) materials are considered. In the low induction range, fitting by the Steinmetz formula is used to compare the methods. Under slow time-varying excitation, the loss in energy observed when samples are magnetized at constant dB/dt is always lower than at constant dH/dt excitation for the same frequency. It is also observed that the PbPM for the low induction range gives a lower value of hysteresis loss than the other methods (approximately 30% for GO-RD, 10% for GO-TD and 5% for NO-RD). © 2003 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Bb Fe and its alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Pulsed field magnetometery for high coercivity permanent magnets

Yoonbae Kim, Hyoungtae Kim, Sungho Cho, and G. A. Kapustin

J. Appl. Phys. 93, 8546 (2003); http://dx.doi.org/10.1063/1.1557763 (3 pages) | Cited 2 times

Online Publication Date: 9 May 2003

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A high sensitivity pulsed field magnetometer for the measurement of thin films or small volume of high coercive rare earth permanent magnets has been constructed. The pickup coil designed in principle of 3-axis compensation has the sensitivity of 5×10−4 emu at tested field of 76 kOe. The compensation has been repeatable within 4×10−4–10×10−4 emu, which is enough for measurement within 2% accuracy for the materials with magnetic moment as small as 5×10−2 emu. Measurements on NdFeB magnet show excellent repeatability within 0.3% discrepancy for remanence and coercivity. The magnetic hysteresis loop of a NdFeB thin film (1050 nm) was measured satisfactorily. Estimation of the eddy current effect, by measuring the similar dimensioned but lower resistive nonmagnetic metals, has also been investigated. © 2003 American Institute of Physics.
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07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements
75.50.Ww Permanent magnets
75.50.Vv High coercivity materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Bb Fe and its alloys
75.70.Ak Magnetic properties of monolayers and thin films
75.30.Cr Saturation moments and magnetic susceptibilities
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