(In/sub 1-x/Mn/sub x/)As diluted diluted magnetic semiconductor quantum dots with above room ferromagnetic transition temperature

2002 ◽  
Author(s):  
Hee Chang Jeon ◽  
Youn Seek Jeong ◽  
Kwang Jae Chung ◽  
Kwang Jo Chung ◽  
Tae Won Kang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transition Temperature ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Semiconductor Quantum Dots ◽  
Ferromagnetic Transition ◽  
Diluted Magnetic

EFFECTS OF PHOTO-EXCITATION AND MAGNON SCATTERING ON FERROMAGNETIC TRANSITION TEMPERATURE OF THE DILUTED MAGNETIC SEMICONDUCTOR (Ga1 - x, Mnx)As

2011 ◽  
Vol 25 (04) ◽  
pp. 273-280 ◽  
Author(s):  
CHERNET AMENTE ◽  
P. SINGH
Keyword(s):  
Transition Temperature ◽  
Spin Wave ◽  
Wave Scattering ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Ferromagnetic Transition ◽  
Photon Irradiation ◽  
Model Hamiltonian ◽  
Diluted Magnetic ◽  
System Properties

Effects of photo-excitation and spin-wave scattering on magnetization of the diluted magnetic semiconductor (DMS) ( Ga , Mn ) As are theoretically studied. Green function formalism is used to find expression for magnetization and ferromagnetic transition temperature TC starting with a model Hamiltonian consisting of magnons, photons and an interaction of magnons with photons. According to our calculation, there is TC in the absence of magnetic impurity, x = 0, indicating that there could be electronically unpaired influential carriers/holes induced by photon irradiation resulting in residual itinerant band magnetization which can be revealed by experiments. Unusual upturn in magnetization near 0 K temperature values for larger magnon–photon coupling constant is also indicated. Moreover, enhancement of magnetization is established with increase in impurity concentration and even further in the presence of photon–magnon coupling which however decreases due to spin-wave scattering. This leads to the conclusion that at lower temperatures photon irradiation and at higher temperatures spin-wave scattering could affect the system properties predominantly.

Tuning Paramagnetic effect of Co-Doped CdS diluted magnetic semiconductor quantum dots

2020 ◽  
Vol 834 ◽  
pp. 155196 ◽  
Author(s):  
Fatma Ibraheem ◽  
Manal A. Mahdy ◽  
Esmat A. Mahmoud ◽  
J. Enrique Ortega ◽  
Celia Rogero ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Semiconductor Quantum Dots ◽  
Paramagnetic Effect ◽  
Diluted Magnetic ◽  
Co Doped
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