Neutron Diffraction Studies of Cd1−xMnxSe Epilayers and ZnSe/MnSe Multilayers

1989 ◽  
Vol 166 ◽  
Author(s):  
T. M. Giebultowicz ◽  
P. Klosowski ◽  
J. J. Rhyne ◽  
N. Samarth ◽  
H. Luo ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Short Range ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Ordering ◽  
Type Iii ◽  
Zinc Blende ◽  
Range Type ◽  
Diluted Magnetic ◽  
Diffraction Patterns

ABSTRACTNeutron diffraction patterns of MBE-grown single crystal zinc-blende epilayers of Cd1−xMnxSe with x=0.70 and 0.75 reveal the onset of long-range Type-III AF ordering at low T, in sharp contrast with earlier studies of bulk II-VI diluted magnetic semiconductors, where only short-range Type III correlations are observed. Results of first neutron diffraction studies of magnetic ordering in MBE-grown ZnSe/MnSe superlattices are also reported.

Neutron diffraction studies of diluted magnetic semiconductors (invited)

1982 ◽  
Vol 53 (11) ◽  
pp. 7644-7648 ◽  
Author(s):  
G. Dolling ◽  
T. M. Holden ◽  
V. F. Sears ◽  
J. K. Furdyna ◽  
W. Giriat
Keyword(s):  
Neutron Diffraction ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Diluted Magnetic

ESR Study of Novel Room-Temperature Ferromagnetic Semiconductors Pb1-X-YSnxCryTe

2010 ◽  
Vol 168-169 ◽  
pp. 404-407
Author(s):  
E.A. Zvereva ◽  
O.A. Savelieva ◽  
S. Ibragimov ◽  
E. Samokhvalov ◽  
E.I. Slynko ◽  
...  
Keyword(s):  
Room Temperature ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Ordering ◽  
Esr Spectra ◽  
Chromium Concentration ◽  
Ferromagnetic Phase ◽  
Wide Range ◽  
Diluted Magnetic ◽  
Ordering Transition

We report on the magnetic properties of novel diluted magnetic semiconductors Pb1 x ySnxCryTe revealing ferromagnetism at temperatures higher than room temperature. Depending on chromium concentration the Curie temperature varies in a wide range (150360 K) and effective magnetic moment achieves 1 B upon an increase of chromium doping level. Electron spin resonance (ESR) spectra in the paramagnetic phase were satisfactory approximated by a single Dysonian line. Effective g-factor tends to the saturation value g=2.080.01, while the linewidth passes through a minimum in the vicinity of magnetic ordering transition and then broadens with an increase of the temperature. In ferromagnetic phase the pronounced distortion and splitting of the ESR spectra into two lines occurs due to additional ferromagnetic contribution to absorption.

Recent Developments in II-VI Diluted Magnetic Semiconductors

1989 ◽  
Vol 161 ◽  
Author(s):  
N. Samarth ◽  
J. K. Furdyna
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Transition Metal Ions ◽  
The Novel ◽  
New Materials ◽  
Zinc Blende ◽  
Recent Developments ◽  
Diluted Magnetic

ABSTRACTMuch of the work in diluted magnetic semiconductors (DMS) in past years has focused on the alloys such as Cd1−xMnxTe. Recently, there has been an increasing accent on DMS alloys containing the transition metal ions Fe2+ and Co2+. We review here the properties of these new materials and compare them with the alloys. We also examine the novel opportunities afforded by the molecular beam epitaxy of epilayers and heterostructures containing the “metastable” zinc-blende phase of Cd1−xMnxSe.

DFT Investigations of Ti, V Doped ZnO Based Diluted Magnetic Semiconductors

2015 ◽  
Vol 1107 ◽  
pp. 502-507
Author(s):  
Bakhtiar Ul Haq ◽  
R. Ahmed ◽  
A. Shaari ◽  
R. Hussain ◽  
Mazmira binti Mohamad
Keyword(s):  
Electronic Structures ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Small Difference ◽  
Impurity Atoms ◽  
Zinc Blende ◽  
Spin Polarized ◽  
Doped Zno ◽  
Diluted Magnetic ◽  
Magnetic Nature

The injection impurity element into ZnO has added new dimension to its versatile applications particularly in spintronics and optoelectronics. In this work, we are reporting effect of non magnetic Ti, and magnetic V impurities in ZnO. The substitution of impurity atoms have been done in ground state wurtzite (WZ) and meta stable zinc-blende (ZB) structure. Our investigations have revealed a small difference in WZ and ZB geometries of contaminated ZnO reflecting on the possibility of their experimental fabrication. Spin polarized electronic structures resembled nonmagnetic nature of Ti:ZnO in WZ and magnetic nature in ZB geometry. Similarly introduction of V in to ZnO induced magnetization in ZnO in both WZ and ZB geometry. For these investigations, we have adapted DFT approach using FP-L(APW+lo) method implemented in WIEN2k code.

HIGH-PRESSURE INDUCED STRUCTURAL PHASE TRANSITION AND ELASTIC PROPERTIES OF DILUTED MAGNETIC SEMICONDUCTORS Zn1-xMnxSe

2008 ◽  
Vol 22 (17) ◽  
pp. 2749-2767 ◽  
Author(s):  
DINESH VARSHNEY ◽  
V. RATHORE ◽  
N. KAURAV ◽  
R. K. SINGH
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Rock Salt ◽  
Elastic Constants ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Structural Phase ◽  
Zinc Blende ◽  
Diluted Magnetic ◽  
Vdw Interaction

An effective interionic interaction potential is developed to study the pressure-induced phase transitions from zinc blende (B3) to rock salt (B1) structure in diluted magnetic semiconductors Zn 1-x Mn x Se (x=0.08 and 0.15). As a first step, the elastic constants, including the long-range Coulomb, van der Waals (vdW) interaction and the short-range repulsive interaction up to second-neighbor ions within the Hafemeister and Flygare approach, are derived. Assuming that both the ions are polarizable, the Slater–Kirkwood variational method is employed to estimate the vdW coefficients. The estimated values of the phase transition pressure (Pt) increase with Mn concentration. The vast volume discontinuity in the pressure volume phase diagram identifies the structural phase transition from zinc blende to rock salt structure. The variation of second-order elastic constants with pressure resembles that observed in some binary semiconductors. It is noticed that the vdW interaction is effective in obtaining the thermodynamical parameters such as Debye temperature, Gruneisen parameter, and thermal expansion coefficient. However, the inconsistency in the value of pressure derivative of the theoretical and experimental value of C44 is attributed to the fact that we have derived the expressions by assuming that the overlap repulsion is significant only up to nearest neighbors, as well as neglecting thermal effects.

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