Four Types of Magnetic Subsystems in Dilute Magnetic Semiconductors Based on A4B6 and A3B6 Compounds

Vasyl Slynko; Volodymyr Boledzyuk; Zakhar Kovalyuk; Lukasz Kilanski; Witold Dobrowolski; Sana Zakar

doi:10.4028/p-YPyP7M

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HomeMaterials Science ForumMaterials Science Forum Vol. 1180Four Types of Magnetic Subsystems in Dilute...

Four Types of Magnetic Subsystems in Dilute Magnetic Semiconductors Based on A⁴B⁶ and A³B⁶ Compounds

Abstract:

The work is devoted to a fundamental study of the magnetic properties of dilute magnetic semiconductors (DMSs). Cubic Sn_1-x-ySi_xMn_yTe (A⁴B⁶) and hexagonal layered In_1-xMn_xSe (A³B⁶) were studied. Analysis of the temperature dependencies of dynamic magnetic susceptibility by fitting with Gaussian curves revealed four universal types of cluster magnetic subsystems (CMSs) in both DMSs, regardless of their crystal structure and the main mechanism of exchange interaction (RKKY in A⁴B⁶ or Kramers in A³B⁶). It is assumed that CMSs are formed by dynamic magnetic clusters (DMCs), whose structure and dimensionality (0D, 1D, 2D, and 3D) are determined by localized vibrational modes (LVMs) and the maximum range of thermal vibrations of Mn ions, which gives them the character of quasistationary formations similar to standing waves. Each CMS is characterized by a set of five critical temperatures (T_F, T_C, Θ, T_K, β), of which T_K and β are introduced for the first time as analogues of T_C and Θ in the region of spin and cluster glasses. This approach made it possible to reveal a symmetry between two types of magnetic disorder: "overheated" paramagnetic (PM) and "supercooled" spin-glass and cluster-glass. The overlap of Gaussian curves corresponding to different CMSs explains the coexistence of spin glass (SG), cluster glass (CG), and ferromagnetic (FM) phases, which we previously observed in Ge_1-x-ySn_xMn_yTe (A⁴B⁶). The effect of annealing on the rearrangement of magnetic subsystems in In_1-xMn_xSe is shown. The concept of integral magnetic susceptibility (IMS) is introduced as a useful tool for the quantitative study of CMSs dynamics. The idea of the possibility of co-using ordered (FM) and disordered magnetic phases (SG and CG) in new functional materials for spintronics is put forward.

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Periodical:

Materials Science Forum (Volume 1180)

Pages:

33-42

DOI:

https://doi.org/10.4028/p-YPyP7M

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Online since:

March 2026

Authors:

Vasyl Slynko*, Volodymyr Boledzyuk, Zakhar Kovalyuk, Lukasz Kilanski, Witold Dobrowolski, Sana Zakar

Keywords:

A³B⁶ Compounds, Cluster Magnetic Subsystems, Dilute Magnetic Semiconductors, Dynamic Magnetic Susceptibility, Functional Materials for Spintronics Based on A⁴B⁶, Magnetic Clusters

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