研究目的
Investigating the unconventional perfectly shaped, fully asymmetric ～90? Néel domain walls in multilayered ?lms of the diluted ferromagnetic semiconductor (Ga,Mn)(As,P) with a stepwise variation of P doping.
研究成果
The study demonstrates the realization of perfect domain structures with well-defined, entirely asymmetric Néel domain walls in multilayered (Ga,Mn)(As,P) films. The observed domain wall asymmetry is attributed to the chiral anisotropy of the films associated with their multilayered structure, which yields a cumulatively amplified Dzyaloshinskii-Moriya interaction and possibly sustained by the anisotropic nonrelativistic exchange interaction. The findings suggest that digital variations of composition during MBE growth can be a useful tool for tuning the anisotropy and chirality of magnetic films.
研究不足
The study is limited to low temperatures (T ? Tc) and specific compositions of (Ga,Mn)(As,P) films. The explanation of the observed domain wall asymmetry relies on the assumption of enhanced Dzyaloshinskii-Moriya interactions due to multiple interfaces, which may not be directly measurable.
1：Experimental Design and Method Selection:
The study involves the growth of graded multilayers of (Ga0.93Mn0.07)As1-xPx using low-temperature molecular beam epitaxy (MBE) with stepwise changes of the phosphorus concentration. The magnetic properties and domain structure of the films were investigated using magneto-optic (MO) indicator technique and high-resolution transmission electron microscopy (TEM).
2：93Mn07)As1-xPx using low-temperature molecular beam epitaxy (MBE) with stepwise changes of the phosphorus concentration. The magnetic properties and domain structure of the films were investigated using magneto-optic (MO) indicator technique and high-resolution transmission electron microscopy (TEM).
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The samples are multilayered films of (Ga,Mn)(As,P) with digitally modulated content of phosphorus. The data sources include MO images, TEM images, and macroscopic magnetization loop measurements.
3：List of Experimental Equipment and Materials:
The equipment includes MBE for film growth, MO indicator technique for domain visualization, and TEM for structural characterization.
4：Experimental Procedures and Operational Workflow:
The films were grown using MBE, and their magnetic properties were characterized using MO imaging and magnetization measurements. The domain structure was visualized using MO imaging with image subtraction technique to enhance contrast.
5：Data Analysis Methods:
The data analysis involved the interpretation of MO images to understand the domain structure and the use of micromagnetic calculations to analyze the domain wall energy and structure.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
