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Magnetic Resonance in Gadolinium Nanoparticles near the Curie Point

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Abstract

The Influence of temperature in the range from 275 to 320 K on ESR spectra and magnetization m of ensembles of spherical gadolinium nanoparticles with the diameter from 89 to 18 nm was studied. The particles with d = 18 nm had a cubic face centered structure and no magnetic transition. At T > TC all particles were paramagnetic, and their g factors were g = 1.98 ± 0.02 irrespective of their size and structure. At T = TC the particles having 28 to 89 nm in size experienced a magnetic and orientation transition; at T < TC their m(H) dependences were described by the Langevin function, and the FMR lines broadened and shifted towards H = 0. FMR lines of the Gd particle ensembles showed a hysteresis behavior during magnetization reversal, which did not correlate with the coercivity of the particles. Dependences of the Gd nanoparticles FMR linewidth ΔH(T) changed proportionally to |T–TC|.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    V. I. Petinov

  2. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    V. V. Dremov

Authors
  1. V. I. Petinov
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  2. V. V. Dremov
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Correspondence to V. I. Petinov.

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Original Russian Text © V.I. Petinov, V.V. Dremov, 2018, published in Zhurnal Tekhnicheskoi Fiziki, 2018, Vol. 88, No. 4, pp. 534–544.

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Petinov, V.I., Dremov, V.V. Magnetic Resonance in Gadolinium Nanoparticles near the Curie Point. Tech. Phys. 63, 519–529 (2018). https://doi.org/10.1134/S1063784218040175

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  • DOI: https://doi.org/10.1134/S1063784218040175

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