Observation of Mn2+ Triplet Clusters and Non-Nearest-Neighbor Exchange Effect in (Cd,Mn)Te

1989 ◽  
Vol 161 ◽  
Author(s):  
Xiaomei Wang ◽  
D. Heiman ◽  
S. Foner ◽  
P. Becla
Keyword(s):  
Nearest Neighbor ◽  
Spin Exchange ◽  
Magnetic Semiconductors ◽  
Full Range ◽  
Ion Pairs ◽  
Dilute Magnetic Semiconductors ◽  
Exchange Interactions ◽  
Exchange Constant ◽  
Exchange Effect ◽  
Random Alloys

Dilute magnetic semiconductors (DMS), such as Cd1−xMnxTe, are excellent hosts for the study of disordered magnetic systems. In these diluted random alloys, neighboring magnetic ions form clusters through short range spin exchange interactions. A number of experiments [1-8] have been devoted to the investigation of the nearest-neighbor (NN) coupled magnetic ion pairs, by measuring the quantized total spin in a field. In (Cd,Mn)Te, the obtained NN exchange constant J1 is -6.1K[7,8]. However, to understand full range of magnetic and optical phenomena in DMS, it is important to explore the behavior of clusters larger than pairs and interactions beyond NN.

MAGNETIC PROPERTIES OF THE DILUTED MAGNETIC SEMICONDUCTORS Zn1−xCoxSe and Zn1−xCoxS

1992 ◽  
Vol 06 (14) ◽  
pp. 2549-2558
Author(s):  
YAOMING MU ◽  
JING-BING ZHU ◽  
PU-LIN LIU ◽  
JIAN-PING PENG ◽  
XUE-CHU SHEN
Keyword(s):  
Diluted Magnetic Semiconductors ◽  
Nearest Neighbor ◽  
Magnetic Semiconductors ◽  
Exchange Interactions ◽  
Low Field ◽  
Magnetic Specific Heat ◽  
Heisenberg Type ◽  
Diluted Magnetic ◽  
Spin Orbit Interactions ◽  
Theory And Experiment

The magnetic specific heat, magnetization and low-field magnetic susceptibility of Co-based diluted magnetic semiconductors Zn 1−x Co x Se and Zn 1−x Co x S have been calculated by using a Hamiltonian which takes into account both the Heisenberg-type nearest-neighbor exchange interactions and spin-orbit interactions. A fair agreement between theory and experiment is obtained. No magnetization steps are predicted in the ranges of temperature and magnetic field considered here.

Exchange Interactions and Curie Temperatures in Dilute Magnetic Semiconductors

2005 ◽  
Vol 160 (1-4) ◽  
pp. 57-65 ◽  
Author(s):  
K. Sato ◽  
P. H. Dederichs ◽  
H. Katayama-Yoshida
Keyword(s):  
Magnetic Semiconductors ◽  
Dilute Magnetic Semiconductors ◽  
Exchange Interactions ◽  
Curie Temperatures

A Review on Chemical Synthesis, Characterization and Optical Properties of Nanocrystalline Transition Metal Doped Dilute Magnetic Semiconductors

2013 ◽  
Vol 201 ◽  
pp. 103-129 ◽  
Author(s):  
Tokeer Ahmad ◽  
Sarvari Khatoon ◽  
Ruby Phul
Keyword(s):  
Optical Properties ◽  
Transition Metal ◽  
Magnetic Semiconductors ◽  
Room Temperature Ferromagnetism ◽  
Magnetic Semiconductor ◽  
Dilute Magnetic Semiconductors ◽  
Exchange Interactions ◽  
Transition Metal Ions ◽  
Modern Technology ◽  
Metal Doped

Nanomaterials have fascinated researchers in recent years because these materials exhibit unusual optical, magnetic and electrical properties as compared to their bulk counterparts. Incorporating impurity ions into a semiconducting host to extend its properties has been one of the most important techniques that paved the way for the modern technology based on spintronic devices. Over the past few years, oxide based dilute magnetic semiconductors (DMSs) have gained remarkable interest due to the possibility of inducing room temperature ferromagnetism. This review describes the experimental developments and optical properties of oxide based DMSs, including the recent results on ZnO, CdO and In2O3 based systems. Optical properties of transition metal (TM)-doped ZnO, CdO and In2O3 dilute magnetic semiconductor nanoparticles show red shift in energy band gaps. Such types of phenomena are attributed to sp-d exchange interactions between band electrons and localized d-electrons of the substituted transition metal ions. Table of Contents

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