Experimental Studies of the d-d Exchange Interactions in Dilute Magnetic Semiconductors

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.

Download Full-text

Exchange Interactions and Curie Temperatures in Dilute Magnetic Semiconductors

Hyperfine Interactions ◽

10.1007/s10751-005-9149-5 ◽

2005 ◽

Vol 160 (1-4) ◽

pp. 57-65 ◽

Cited By ~ 9

Author(s):

K. Sato ◽

P. H. Dederichs ◽

H. Katayama-Yoshida

Keyword(s):

Magnetic Semiconductors ◽

Dilute Magnetic Semiconductors ◽

Exchange Interactions ◽

Curie Temperatures

Download Full-text

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

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.201.103 ◽

2013 ◽

Vol 201 ◽

pp. 103-129 ◽

Cited By ~ 5

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

Download Full-text