研究目的
Determining conditions and mechanisms of controlled variation of the magnetic anisotropy of GaMnSb films containing magnetic MnSb nanoinclusions by means of heat treatment.
研究成果
The heat treatment of GaMnSb films leads to a significant increase in the values of characteristics determined by the magnetic anisotropy, including the growth of blocking temperature and the magnetic anisotropy field. This change is related to a transition of the crystalline structure of magnetic MnSb nanoinclusions from hexagonal to cubic.
研究不足
The study was limited to GaMnSb films with specific thickness and area. The effects of heat treatment were only investigated up to 350°C for 30 min. The analysis of the crystalline structure was challenging due to the polycrystalline character of the films.
1：Experimental Design and Method Selection:
The study involved measuring the temperature and magnetic-field dependences of the magnetic moments of GaMnSb films before and after thermal annealing using a SQUID magnetometer.
2：Sample Selection and Data Sources:
Thin GaMnSb films with thicknesses about 100 nm and areas about 1 cm2 were prepared from a GaSb–MnSb eutectic alloy by pulsed laser deposition.
3：List of Experimental Equipment and Materials:
SQUID magnetometer (MPMS 5XL Quantum Design), SmartSPM-1000 (AIST-NT Inc.) scanning probe microscope, TITAN 80–3000 (FEI Co. United States) electron microscope, Gatan 691 PIPS (GATAN Co., United States).
4：Experimental Procedures and Operational Workflow:
The films were characterized by Raman spectra, magnetic-force microscopy, scanning and transmission electron microscopy techniques. The magnetic hysteresis loops were measured at various temperatures.
5：Data Analysis Methods:
The temperature dependences of the magnetic moment were analyzed to determine the blocking temperature and magnetic anisotropy field. The magnetic hysteresis loops were analyzed to determine the coercive field.
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