Combinatorial Investigation of Spintronic Materials

MRS Bulletin ◽  
2003 ◽  
Vol 28 (10) ◽  
pp. 734-739 ◽  
Author(s):  
Y. Matsumoto ◽  
H. Koinuma ◽  
T. Hasegawa ◽  
I. Takeuchi ◽  
F. Tsui ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Room Temperature ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Transition ◽  
Heusler Alloys ◽  
Oxide Systems ◽  
Diluted Magnetic

AbstractHigh-throughput synthesis and characterization techniques have been effective in discovering new materials and performing rapid mapping of phase diagrams. The application of the combinatorial strategy to explore doped transition-metal oxides has led to the discovery of a transparent room-temperature ferromagnetic oxide in Co-doped anatase TiO2. The discovery has triggered a wave of studies into other metal oxide systems in pursuit of diluted magnetic semiconductors. In this article, we describe recent combinatorial studies of magnetic transition-metal oxides, germanium-based magnetic semiconductors, and Heusler alloys.

Successive Spin-Correlated Local Processes Underlying the Magnetism in Diluted Magnetic Semiconductors and Related Magnetic Materials

2016 ◽  
pp. 13-27
Author(s):  
Antonis N. Andriotis ◽  
Madhu Menon
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Spin Polarization ◽  
Transition Metal Oxides ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Nearest Neighbors ◽  
Synergistic Action ◽  
Superexchange Coupling ◽  
Diluted Magnetic

Recent works have suggested that the defect induced magnetism in Diluted Magnetic Semiconductors (DMSs), Transition Metal Oxides (TMOs) and related materials is facilitated and enhanced by codoping and the synergistic action between the codopants. In the present work we demonstrate that the proposed defect synergy is the result of the interplay among correlated spin-polarization processes which take place in a successive way in neighborhoods centered at the codopants and include their first nearest neighbors. These processes result in a reduction in the superexchange coupling which in turn causes an enhancement in the ferromagnetic coupling (FMC) among the magnetic dopants. The proposed FMC is demonstrated using ab initio calculations of the electronic properties of codoped ZnO, GaN and TiO2.

scholarly journals Room temperature ferromagnetism in metallic Ti1−xVxO2 thin films

RSC Advances ◽  
2018 ◽  
Vol 8 (55) ◽  
pp. 31382-31387 ◽  
Author(s):  
Ze-Ting Zeng ◽  
Feng-Xian Jiang ◽  
Li-Fei Ji ◽  
Hai-Yun Zheng ◽  
Guo-Wei Zhou ◽  
...  
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Room Temperature ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Room Temperature Ferromagnetism ◽  
Diluted Magnetic ◽  
Metal Doped

Transition metal doped TiO2 diluted magnetic semiconductors have attracted considerable interest due to their room temperature ferromagnetism.

Novel Room-temperature Ferromagnetic Semiconductors Pb1-x-yCaxCryTe

2009 ◽  
Vol 1183 ◽  
Author(s):  
Evgeny P. Skipetrov ◽  
Elena A. Zvereva ◽  
Nikolay A. Pichugin ◽  
Alexey E. Primenko ◽  
Evgeny I. Slyn'ko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Room Temperature ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Impurity Level ◽  
Ferromagnetic Semiconductors ◽  
Magnetization Curves ◽  
Diluted Magnetic ◽  
Ferromagnetic Ordering

Abstract The galvanomagnetic and magnetic properties of novel diluted magnetic semiconductors Pb1-x-yCaxCryTe (x=0.06-0.20, y=0.003-0.045) have been investigated. Temperature dependencies of the resistivity and the Hall coefficient have a metallic character indicating the pinning of Fermi level by the chromium impurity level on the background of the conduction band states. Magnetization curves display a clear hysteresis loop over the whole temperature range investigated. The Curie temperature, determined from the temperature dependencies of magnetization, achieves 345 K. Possible mechanisms of ferromagnetic ordering were discussed.

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