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High-frequency heating and dynamic susceptibility of small La1 − x Ag y MnO3 + δ particles in the range of the magnetic phase transition

  • Radio Phenomena in Solids and Plasma
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Abstract

The nanoparticles of the lanthanum-silver manganites with the general formula La1 − x Ag y MnO3 + δ (LAMO) that exhibit the Curie temperature T C in the range 35…50°C, which is important for medical applications, are synthesized and studied. The heating kinetics of the LAMO aqueous suspensions under the action of the high-frequency (HF) magnetic field is experimentally studied and the self-stabilization in the vicinity of the Curie temperature is demonstrated. A sharp increase in the HF-absorption (specific absorption rate) is observed for the materials under study when approaching the Curie temperature from below. This effect is proven by direct measurements of the dynamic magnetic susceptibility in the critical range. The physical interpretations of the HF absorption are based on the hysteresis and oscillations of domain boundaries. It is demonstrated that the materials under study are promising for the medical hyperthermia with controlled heating temperature.

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Authors
  1. V. A. Atsarkin
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  2. A. A. Generalov
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  3. V. V. Demidov
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  4. A. E. Mefed
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  5. M. N. Markelova
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  6. A. R. Kaul’
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Additional information

Original Russian Text © V.A. Atsarkin, A.A. Generalov, V.V. Demidov, A.E. Mefed, M.N. Markelova, A. R. Kaul’, 2010, published in Radiotekhnika i Elektronika, 2010, Vol. 5, No. 6, pp. 702–714.

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Atsarkin, V.A., Generalov, A.A., Demidov, V.V. et al. High-frequency heating and dynamic susceptibility of small La1 − x Ag y MnO3 + δ particles in the range of the magnetic phase transition. J. Commun. Technol. Electron. 55, 657–667 (2010). https://doi.org/10.1134/S1064226910060070

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  • DOI: https://doi.org/10.1134/S1064226910060070

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