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Curie point of ferromagnets

Yaakov Kraftmakher

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A student experiment is described concerning properties of ferromagnets near the Curie point. Gadolinium provides a good opportunity to determine the magnetic susceptibility above the transition point and to evaluate the critical exponent of the susceptibility. The temperature dependence of the electrical resistance of nickel at enhanced frequencies shows the influence of the magnetic properties of the sample on the skin depth. From the measurements, the phase transition is clearly seen and the temperature dependence of the magnetic permeability below the Curie point is available. Data on the resistance at an enhanced frequency reveal the phase transition in a nickel-based alloy. These items may be added to related student experiments described previously.

Zusammenfassung. Ein Studentenexperiment in Beziehung der Eigenschaften eines Ferromagnetikums nahe des Curie-Punktes ist beschrieben. Gadolinium bietet eine gute Gelegenheit, die magnetische Suszeptibilität über der Übergangstemperatur auszuwerten und den kritischen Exponent der Suszeptibilität berechnen. Die Temperaturabhängigkeit des elektrischen Widerstandes des Nickels in höheren Frequenzen demonstriert den Einfluß der magnetischen Eigenschaften der Probe auf die Skinschicht. Von den Messungen, der Phasenübergang ist klar und die Temperaturabhändigkeit der magnetischen Permeabilität unter der Curie-Temperatur kann berechnet werden. Die Daten des Widerstandes in höheren Frequenzen enthüllen den Phasenübergang in einer Nickellegierung. Vorher beschriebene Studentenexperimente können mit obigen Punkten ergänzt werden.


PACS

75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)

75.30.Cr Saturation moments and magnetic susceptibilities

75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

01.50.My Demonstration experiments and apparatus

Subjects

Condensed matter: electrical, magnetic and optical

Education and communication

Dates

Issue 6 (November 1997)

Received 4 June 1997, in final form 18 August 1997



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