Magnetic ordering transition of electrons on mesoscopic tubes

1993 ◽  
Vol 48 (23) ◽  
pp. 17545-17550 ◽  
Author(s):  
P. S. Davids ◽  
L. Wang ◽  
A. Saxena ◽  
A. R. Bishop
Keyword(s):  
Magnetic Ordering ◽  
Ordering Transition

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.

scholarly journals Enhanced spin pumping near a magnetic ordering transition

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
Behrouz Khodadadi ◽  
Jamileh Beik Mohammadi ◽  
Claudia Mewes ◽  
Tim Mewes ◽  
M. Manno ◽  
...  
Keyword(s):  
Magnetic Ordering ◽  
Spin Pumping ◽  
Ordering Transition

scholarly journals Single phase charge ordered stoichiometric CaFe3O5 with commensurate and incommensurate trimeron ordering

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Simon J. Cassidy ◽  
Fabio Orlandi ◽  
Pascal Manuel ◽  
Simon J. Clarke
Keyword(s):  
Single Phase ◽  
Magnetic Ordering ◽  
Phase Behaviour ◽  
Metal Compounds ◽  
Teller Distortion ◽  
Magnetic Structures ◽  
Jahn Teller ◽  
Complex Structural ◽  
A Charge ◽  
Ordering Transition

AbstractMixed-valent transition metal compounds display complex structural, electronic and magnetic properties which can often be exquisitely tuned. Here the charge-ordered state of stoichiometric CaFe3O5 is probed using neutron powder diffraction, Monte Carlo simulation and symmetry analysis. Magnetic ordering is dominated by the formation of ferromagnetic Fe3+–Fe2+–Fe3+ trimers which are evident above the magnetic ordering transition. Between TN = 289 K and 281 K an incommensurate magnetically ordered phase develops due to magnetic frustration, but a spin Jahn-Teller distortion lifts the frustration and enables the magnetic ordering to lock in to a charge-ordered commensurate state at lower temperatures. Stoichiometric CaFe3O5 exhibits single phase behaviour throughout and avoids the phase separation into two distinct crystallographic phases with different magnetic structures and Fe valence distributions reported recently, which likely occurs due to partial Fe2+ for Ca2+ substitution. This underlines the sensitivity of the magnetism and chemistry of these mixed-valent systems to composition.

Anomalous magnetic ordering transition and induced Raman scattering in BiFeO3 thin films

2007 ◽  
Vol 1034 ◽  
Author(s):  
Manoj K Singh ◽  
W Prellier ◽  
H M Jang ◽  
Ram S Katiyar
Keyword(s):  
Thin Films ◽  
Characteristic Temperature ◽  
Pulsed Laser ◽  
Magnetic Ordering ◽  
Laser Deposition ◽  
Zero Field ◽  
Bifeo3 Thin Films ◽  
Raman Modes ◽  
Ordering Transition ◽  
Zone Folding

AbstractLow temperature magnetic properties and Raman spectrum of highly (111)-oriented rhombohedral BiFeO3 (BFO) thin films epitaxially grown on (111) SrTiO3 substrates by pulsed laser deposition have been studied. Zero field cooled (ZFC) and field cooled (FC) magnetization curves display divergence at characteristic temperature Tirr (H), which are magnetic field dependent, suggesting a spin-glass like behavior of the film. The change in magnetic ordering results in anomalous phonon behavior such as the extraordinary enhancement and appearance of new Raman modes due to Brillouin zone folding below ∼200 K.

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