XVI Russian Conference on Semiconductor Physics, October 7-11, 2024, St. Petersburg
Magnetism, spintronics
The magnetic properties of InMnSb films obtained by pulsed laser deposition
A. I. Dmitrieva,
L. S. Parshinab,
M. S. Dmitrievaa,
O. D. Khramovab,
O. A. Novodvorskiib a Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Moscow region
b National Research Centre "Kurchatov Institute", Moscow, Russia
Abstract:
The magnetic properties of InMnSb films obtained by pulsed laser deposition were studied. The temperature dependences of the magnetic moment of the films
$M(T)$ cooled in zero magnetic field (ZFC) and a magnetic field of 50 kOe (FC) were measured in different magnetic fields. Analysis of the obtained magnetic data showed that the films consist of two magnetic subsystems: the ferromagnetic subsystem of MnSb nanoinclusions and the paramagnetic subsystem of dispersed Mn
$^{2+}$ ions in the InSb matrix. Approximation of the
$M(T)$ dependence of the paramagnetic fraction by the Curie–Weiss function made it possible to estimate the concentration of dispersed Mn
$^{2+}$ impurity ions
$n_i$ = (6.8
$\pm$ 0.5)
$\cdot$ 10
$^{19}$ cm
$^{-3}$, which significantly exceeds the solubility limit of manganese impurity in bulk InSb crystals. As a result of analysis of the
$M(T)$ curve of the ferromagnetic phase of MnSb nanoinclusions within the framework of the Bloch 3/2 law, the saturation magnetization
$M_{\mathrm{S}}$ = 225
$\pm$ 24 emu/cm
$^3$ (1.1
$\pm$ 0.1
$\mu$B/ion) and the Curie temperature
$T_{\mathrm{C}}$ = 529
$\pm$ 6 K of MnSb nanoinclusions were determined. The values of both quantities turned out to be significantly lower than in massive single-crystal samples. Analysis of FC - ZFC dependences measured in different fields allowed us to establish the dependence of the blocking temperature
$T_{\mathrm{b}}$ of MnSb nanoinclusions on the external magnetic field strength
$H$. Approximation of the
$T_{\mathrm{b}}(H)$ dependence allowed us to estimate the field values
$H_{\mathrm{a}}$ = 812
$\pm$ 265 Oe and the magnetic anisotropy constants
$K$ = (1.1
$\pm$ 0.3)
$\cdot$ 10
$^5$ erg/cm
$^3$, which turned out to be close to the corresponding value determined earlier for Mn
$_x$Sb
$_{1-x}$ single crystals of non-stoichiometric composition
$x$ = 52.8%.
Keywords:
substituted lanthanum orthoferrites, canted antiferromagnetism, vacuum annealing. Received: 02.12.2024
Revised: 03.12.2024
Accepted: 04.12.2024
DOI:
10.61011/FTT.2025.01.59784.332
Fulltext:
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