scholarly journals Novel photoinduced phase transitions in transition metal oxides and diluted magnetic semiconductors

2012 ◽  
Vol 7 (1) ◽  
Author(s):  
Takashi Mizokawa
Keyword(s):  
Phase Transitions ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Diluted Magnetic

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.

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