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High Temperature Magnetic Properties of Dysprosium Iron Garnet (DyIG) Revisited: A Simple Mean-Field Analysis

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Proceedings of the 4th International Symposium on Materials and Sustainable Development (ISMSD 2019)

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Abstract

In this paper, the high temperature magnetic properties of Dy3Fe5O12 (DyIG) spherical single crystals are revisited by means of two types of magnetization measurements in D.C. magnetic fields. At first, isothermal magnetizations are performed in the range 125–300 K as a function of the internal field H up to 30 kOe applied in the case of the freely rotating sample and along the <111>(easy), <110>(intermediate), and <100>(hard) axes of magnetization. Close to the magnetic compensation temperature Tcomp = 218.40 K, the MT(H) curves associated to the three axes show no detectable anomaly, behave as the straight lines passing through the origin and the phases are canted. Far away Tcomp, critical fields HC1 less than 3 kOe appear for the non easy axes and the phases are canted for H < HC1. For H > HC1, the phases become collinear and the curves rejoin the associated one along <111> which reaches saturation for H ~ 300 Oe. There is no effect of the anisotropy in the determination of both spontaneous magnetization and paraprocess susceptibility. Secondly, isofield magnetizations are recorded at fixed external Hex = 30 kOe, while T is varied by steps in the range 205–230 K. The derivatives of the MHex(T) curves are used to assign differently the transitions which are observed at critical temperatures TC2 between one canted phase and two inverse collinear phases on each side of Tcomp. Based on the Néel’s theory and beyond the Pauthenet’s method, molecular field coefficients of the interactions between Fe3+ and Dy3+ ions and within the Dy3+ ions at Tcomp are found and the question about their discontinuities is discussed with previous results.

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Authors and Affiliations

  1. Faculty of Sciences, Department of Physics, Laboratory L.P.S., Badji Mokhtar Annaba University, 23000, Annaba, Algeria

    M. Lahoubi & A. Boutaba

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  1. M. Lahoubi
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  2. A. Boutaba
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Correspondence to M. Lahoubi .

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Editors and Affiliations

  1. Université M’hamed Bougara Boumerdes, Boumerdès, Algeria

    Abdelbaki Benmounah

  2. Université M’hamed Bougara Boumerdes, Boumerdès, Algeria

    Mohamed Tahar Abadlia

  3. Faculté de Technologie, Université M’hamed Bougara Boumerdes, Boumerdès, Algeria

    Mohamed Saidi

  4. Université M’hamed Bougara Boumerdes, Boumerdès, Algeria

    Abdellatif Zerizer

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Lahoubi, M., Boutaba, A. (2020). High Temperature Magnetic Properties of Dysprosium Iron Garnet (DyIG) Revisited: A Simple Mean-Field Analysis. In: Benmounah, A., Abadlia, M.T., Saidi, M., Zerizer, A. (eds) Proceedings of the 4th International Symposium on Materials and Sustainable Development. ISMSD 2019. Springer, Cham. https://doi.org/10.1007/978-3-030-43268-3_14

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