A Group-IV Ferromagnetic Semiconductor: Mn x Ge 1− x
- 25 January 2002
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 295 (5555) , 651-654
- https://doi.org/10.1126/science.1066348
Abstract
We report on the epitaxial growth of a group-IV ferromagnetic semiconductor, MnxGe1−x, in which the Curie temperature is found to increase linearly with manganese (Mn) concentration from 25 to 116 kelvin. The p-type semiconducting character and hole-mediated exchange permit control of ferromagnetic order through application of a ±0.5-volt gate voltage, a value compatible with present microelectronic technology. Total-energy calculations within density-functional theory show that the magnetically ordered phase arises from a long-range ferromagnetic interaction that dominates a short-range antiferromagnetic interaction. Calculated spin interactions and percolation theory predict transition temperatures larger than measured, consistent with the observed suppression of magnetically active Mn atoms and hole concentration.Keywords
This publication has 26 references indexed in Scilit:
- Hole-mediated ferromagnetism in tetrahedrally coordinated semiconductorsPhysical Review B, 2001
- Hamiltonian of theSpin System from First-Principles Density-Functional CalculationsPhysical Review Letters, 2001
- Room Temperature Ferromagnetism in Novel Diluted Magnetic Semiconductor Cd1-xMnxGeP2Japanese Journal of Applied Physics, 2000
- Magnetic moment of Mn in the ferromagnetic semiconductor (Ga0.98Mn0.02)AsApplied Physics Letters, 2000
- Zener Model Description of Ferromagnetism in Zinc-Blende Magnetic SemiconductorsScience, 2000
- Ab initio pseudopotentials for electronic structure calculations of poly-atomic systems using density-functional theoryComputer Physics Communications, 1999
- Interplay between the magnetic and transport properties in the III-V diluted magnetic semiconductorPhysical Review B, 1997
- Antiferromagnetic Exchange Interactions from Hybrid Density Functional TheoryPhysical Review Letters, 1997
- Diluted magnetic III-V semiconductorsPhysical Review Letters, 1989
- Photoinduced Magnetism and Conduction Electrons in Magnetic SemiconductorsPhysica Status Solidi (b), 1988