Magnetic Impurity Band and Photoinduced Magnetic Phase Transition in Diluted Magnetic Semiconductors

2002 ◽  
Vol 75 (7-8) ◽  
pp. 1035-1041
Author(s):  
Masao Takahashi
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Impurity ◽  
Magnetic Semiconductors ◽  
Magnetic Phase ◽  
Impurity Band ◽  
Diluted Magnetic

Ce doping influence on the magnetic phase transition in In2S3:Ce nanoparticles

CrystEngComm ◽  
2014 ◽  
Vol 16 (13) ◽  
pp. 2584-2588 ◽  
Author(s):  
Binbin Yao ◽  
Pan Wang ◽  
Shuangming Wang ◽  
Mingzhe Zhang
Keyword(s):  
Phase Transition ◽  
Quantum Phase Transition ◽  
Magnetic Phase Transition ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Phase ◽  
Long Range Order ◽  
Thermally Driven ◽  
Diluted Magnetic ◽  
Superparamagnetic State

The classical thermally driven transition from supermagnetic to blocked supermagnetic and quantum phase transition from magnetic long-range order to quantum superparamagnetic state have been observed in ultrasmall In2S3:Ce diluted magnetic semiconductors.

Effects of clustering and dimensionality on the magnetic properties of diluted magnetic semiconductors

2003 ◽  
Vol 794 ◽  
Author(s):  
R. N. Bhatt ◽  
Malcolm. P. Kennett ◽  
Adel Kassaian
Keyword(s):  
Magnetic Properties ◽  
Transition Temperature ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Mean Field ◽  
Impurity Band ◽  
Growth Conditions ◽  
Band Model ◽  
Ferromagnetic Transition ◽  
Diluted Magnetic

ABSTRACTThe magnetic properties of films of diluted magnetic semiconductors (DMS) such as (Ga,Mn)As, as well as bulk grown crystals of similar materials, have been found to be extremely sensitive to growth conditions, both in terms of the ferromagnetic transition temperature, and the details of their magnetization curves. We study an impurity band model for carriers in Mn-doped DMS applicable in the low carrier density regime, and discuss the effects of clustering on the magnetic properties of DMS, using both numerical mean field and Monte Carlo simulations. In addition, we study the effects of dimensionality on the transition temperature and other magnetic behaviour, and compare our results with experimental data.

scholarly journals Molecular-Field Approximation in the Theory of Ferromagnetic Phase Transition in Diluted Magnetic Semiconductors

2021 ◽  
Vol 66 (6) ◽  
pp. 503
Author(s):  
Yu.G. Semenov ◽  
S.M. Ryabchenko
Keyword(s):  
Phase Transition ◽  
Spin Polarization ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Field Approximation ◽  
Ferromagnetic Phase ◽  
Spin Interaction ◽  
Free Carriers ◽  
Ferromagnetic Phase Transition ◽  
Diluted Magnetic

In this pedagogical paper, the comparative analysis of two common approaches describing the ferromagnetic phase transition in diluted magnetic semiconductors (DMS) is expounded in terms of the Weiss field approximation. Assuming a finite spin polarization of the magnetic ions, the treatment of carrier-ion exchange interaction in the first order evokes a homogeneous Weiss molecular field that polarizes the spins of free carriers. In turn, this spin polarization of the free carriers exerts the effective field that may stabilize the DMS spin polarization belowa critical temperature TC. The treatment of such self-consistent spontaneous DMS magnetization can be done in terms of the spin-spin interaction independent of the inter-ion distance and the infinitesimal in thermodynamic limit. On the other hand, by additionally accounting for the second-order effects of the carrier-ion exchange interaction, we can treat a Weiss field in terms of the Ruderman–Kittel–Kasuya–Yosida indirect spin-spin interaction, which oscillates and does not disappear at finite inter-ion distances in the case of a finite concentration of carriers. These both approaches result in the same Curie temperature TC provided a non-correlated homogeneous random distribution of the localized spin moments over the sample volume. We discuss the origin of such coincidence and show when this is not a case in other more realistic models of the conducting DMSs.

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