研究目的
To study the influence of quantum well structure and growth temperature on a synthesized multilayer system composed of a five-layer InMnGaAs quantum well with an InGaAs buffer layer grown on semi-insulating (100)-oriented substrates prepared by low temperature molecular beam epitaxy.
研究成果
The study confirmed the presence of ferromagnetism with a Curie temperature above room temperature in the five-layer InGaMnAs quantum well structure with an InGaAs buffer layer. The ferromagnetism results from a superposition of the ferromagnetism of the low temperature region from substitutional Mn ions into Ga sites or interstitial Mn ions as well as the presence of GaMn clusters.
研究不足
The study is limited by the specific conditions of the MBE growth process and the characterization techniques used. The formation of ferromagnetic clusters and their influence on the properties of the quantum well structure may vary under different growth conditions or with alternative characterization methods.
1：Experimental Design and Method Selection:
The study involved the synthesis of a five-layer InGaMnAs quantum well with an InGaAs buffer layer using low temperature molecular beam epitaxy (MBE).
2：Sample Selection and Data Sources:
Semi-insulating (100)-oriented GaAs substrates were used. The samples were characterized using secondary ion mass spectroscopy (SIMS), X-ray diffraction (XRD), photoluminescence (PL), and superconducting quantum interference device (SQUID) measurements.
3：List of Experimental Equipment and Materials:
Riber 2300 molecular beam epitaxy system, SQUID magnetometer, high-sensitivity alternating gradient magnetometer (AGM), XRD with standard CuKα1 irradiation and a high quality Ge collimator, PL measurement system with a closed-cycle He refrigerator and an Ar-ion laser.
4：Experimental Procedures and Operational Workflow:
The samples were grown at specific temperatures, with layers of GaAs buffer, LT-GaAs, InGaMnAs QW, and InGaAs buffer layer sequentially deposited. Magnetic and structural characterizations were performed post-growth.
5：Data Analysis Methods:
The data from SQUID, XRD, SIMS, and PL measurements were analyzed to determine the magnetic and structural properties of the samples.
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