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Metals 2017, 7(6), 215;

Low Field Magnetic and Thermal Hysteresis in Antiferromagnetic Dysprosium

Department of Modern Functional Materials, ITMO University, 49 Kronverkskiy av., St. Petersburg 197101, Russia
Department of Physics, University of Balearic Islands, Cra. Valldemossa km 7.5, 07122 Palma de Mallorca, Spain
Departamento de Física, Universidad Pública de Navarra (UPNA), Campus Arrosadia, 31006 Pamplona, Spain
Author to whom correspondence should be addressed.
Received: 3 May 2017 / Revised: 31 May 2017 / Accepted: 7 June 2017 / Published: 12 June 2017
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Magnetic and thermal hysteresis (difference in magnetic properties on cooling and heating) have been studied in polycrystalline Dy (dysprosium) between 80 and 250 K using measurements of the reversible Villari effect and alternating current (AC) susceptibility. We argue that measurement of the reversible Villari effect in the antiferromagnetic phase is a more sensitive method to detect magnetic hysteresis than the registration of conventional B(H) loops. We found that the Villari point, recently reported in the antiferromagnetic phase of Dy at 166 K, controls the essential features of magnetic hysteresis and AC susceptibility on heating from the ferromagnetic state: (i) thermal hysteresis in AC susceptibility and in the reversible Villari effect disappears abruptly at the temperature of the Villari point; (ii) the imaginary part of AC susceptibility is strongly frequency dependent, but only up to the temperature of the Villari point; (iii) the imaginary part of the susceptibility drops sharply also at the Villari point. We attribute these effects observed at the Villari point to the disappearance of the residual ferromagnetic phase. The strong influence of the Villari point on several magnetic properties allows this temperature to be ranked almost as important as the Curie and Néel temperatures in Dy and likely also for other rare earth elements and their alloys. View Full-Text
Keywords: rare earth metals; magnetostriction; antiferromagnetism; Villari effect rare earth metals; magnetostriction; antiferromagnetism; Villari effect

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Liubimova, I.; Corró Moyà, M.L.; Torrens-Serra, J.; Recarte, V.; Pérez-Landazábal, J.I.; Kustov, S. Low Field Magnetic and Thermal Hysteresis in Antiferromagnetic Dysprosium. Metals 2017, 7, 215.

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