E. N. Kablov, O. G. Ospennikova, I. I. Rezchikova, R. A. Valeev, I. V. Cherednichenko, E. I. Kunitsyna, R. B. Morgunov, V. P. Piskorsky, “Low-temperature anomaly of the magnetization in alloys (Pr, Dy, $M$)$_{2}$(Fe, Co)$_{14}$B ($M$ = Gd, Sm, Nd)”, Fizika Tverdogo Tela, 2016, Volume 58, Issue 3,Pages 502

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Magnetism

Low-temperature anomaly of the magnetization in alloys (Pr, Dy, $M$)$_{2}$(Fe, Co)$_{14}$B ($M$ = Gd, Sm, Nd)

E. N. Kablov^a, O. G. Ospennikova^a, I. I. Rezchikova^a, R. A. Valeev^a, I. V. Cherednichenko^a, E. I. Kunitsyna^b, R. B. Morgunov^b, V. P. Piskorsky^a

^a All-Russian Scientific Research Institute of Aviation Materials, Moscow
^b Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region

Abstract: It has been found that temperature dependences of the saturation magnetization of sintered hard magnetic (Pr, Dy, $M$)$_{2}$(Fe, Co)$_{14}$B ($M$ = Gd, Sm, Nd) alloys demonstrate an increase at a temperature lower than a critical temperature (150 K for Sm and Nd and 70 K for Gd). An additive of copper does not influence the critical temperature. It has been assumed that there is a low-temperature phase in which cobalt is replaced with boron that diffuses from the (Pr, Dy, Gd)(Fe, Co)$_{4}$B phase to the near-surface region of grains of the main magnetic (Pr, Dy, Gd)$_{2}$(Fe, Co)$_{14}$B phase.

Keywords: Boron, Critical Temperature, Saturation Magnetization, Exchange Coupling, Anisotropy Field.

Received: 24.08.2015