Experimental Investigation on the Low-Temperature Anomalies in Dysprosium Iron Garnet (DyIG)
The anomalous physical properties of dysprosium iron garnet Dy3Fe5O12 or DyIG single crystals have been revisited at low temperatures. This paper presents results of experimental investigation based on specific heat, magnetization, and Faraday rotation measurements. The distinguishing features are the occurrence of two types of anomalies in the temperature dependences of some judicious quantities. The first one coincides with the previous first-order spin reorientation transition at TSR = 15 K where the iron sublattice magnetization vector MFe changes from the <111> axis at high temperature toward the low angular <uuw> phases below TSR. The second one takes place around the “low-temperature Belov point” TB = 42 K, confirming what had already been predicted previously about the paraprocess effect in this ferrimagnet. The results are compared with previous findings and discussed taking into account the coexistence of some concomitant phenomena such the magnetodielectric and Schottky effects which cause anomalies, respectively near TSR and TB.
KeywordsDy3Fe5O12 Ferrimagnetism Spin reorientation Low-temperature Belov point Paraprocess effect
In memory of D. Givord who passed away in February 2019. He was the director of the C.N.R.S. 'Laboratoire Louis Néel' in Grenoble (1992-2000). This work is supported by the Ministry of Higher Education and Scientific Research of Algeria. It is a part of a previous joint-cooperation project through the Algerian–French CMEP program between Badji Mokhtar-Annaba University, Annaba, Algeria, and Joseph Fourier University-C.N.R.S., Grenoble, France. Special thanks are presented to Prof. W. Wang (Beijing University of Chemical Technology, School of Science, Beijing, China) for his collaboration and to Prof. U. V. Valiev (Tashkent State University, Uzbekistan) for his interest in our work.
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