Activated dynamic scaling in spin glasses above the freezing temperature

1986 ◽  
Vol 34 (9) ◽  
pp. 6579-6581 ◽  
Author(s):  
A. P. Malozemoff ◽  
E. Pytte
Keyword(s):  
Spin Glasses ◽  
Freezing Temperature ◽  
Dynamic Scaling

scholarly journals Physical model for static and dynamic scaling in spin glasses

1985 ◽  
Vol 57 (8) ◽  
pp. 3410-3412 ◽  
Author(s):  
A. P. Malozemoff ◽  
B. Barbara
Keyword(s):  
Physical Model ◽  
Spin Glasses ◽  
Dynamic Scaling

Reexamination of critical dynamic scaling in spin glasses

1990 ◽  
Vol 67 (9) ◽  
pp. 5249-5251 ◽  
Author(s):  
S. Geschwind ◽  
D. A. Huse ◽  
G. E. Devlin
Keyword(s):  
Spin Glasses ◽  
Dynamic Scaling ◽  
Critical Dynamic

scholarly journals Magnetic Correlations in Spin Glasses above the Freezing Temperature investigated by High Field Mössbauer Spectroscopy

1998 ◽  
Vol 51 (2) ◽  
pp. 349 ◽  
Author(s):  
J. Bogner ◽  
H. Schachner ◽  
M. Reissner ◽  
W. Steiner
Keyword(s):  
External Field ◽  
Temperature Dependence ◽  
Power Law ◽  
Spin Glasses ◽  
High Field ◽  
Freezing Temperature ◽  
Hyperfine Fields ◽  
Magnetic Correlations ◽  
Neighbour Shell ◽  
Centre Shift

The strong dynamics of magnetic correlations are observed by high field 57Fe Mössbauer investigations for the spin glasses AuFe and Y(Fe, Al)2 in the temperature interval between the freezing temperature Tf and approximately 7 to 10Tf. All recorded spectra can be analysed with a model which takes into account these dynamics by allowing the formation of correlated states after a stochastically varying time τoff and their decay after a time τon, restricting the number of subspectra to the different number of Fe atoms in the first neighbour shell. Whereas for the different Fe environments, in addition to centre shift and quadrupole splitting, different hyperfine fields of the two stochastically formed states can always be resolved, the same set of τon and τoff values was obtained for all subspectra above approximately 4Tf. The external field hinders the decay of the correlated regions. The temperature dependence of ¿ on scales with Tf and exhibits a power law with exponents of –2 for the Fe-rich and –1 for the Fe-poor compounds.

Dynamic scaling inCd1−xMnxTe spin glasses: A probe of the spin autocorrelation function

1993 ◽  
Vol 48 (18) ◽  
pp. 13573-13578 ◽  
Author(s):  
Bénédicte Leclercq ◽  
Claudette Rigaux
Keyword(s):  
Autocorrelation Function ◽  
Spin Glasses ◽  
Dynamic Scaling

Positive Magnetisation in Carbon Nanoclusters Produced by High-Repetition-Rate Laser Ablation

2007 ◽  
Vol 998 ◽  
Author(s):  
Andrei V. Rode ◽  
Denis Arcon ◽  
Andrej Zorko ◽  
Zvonko Jaglicic ◽  
Andrew G. Christy ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Spin Glass ◽  
Repetition Rate ◽  
Spin Glasses ◽  
Glass Structure ◽  
Freezing Temperature ◽  
High Repetition Rate ◽  
Zero Field ◽  
High Repetition ◽  
Carbon Nanoclusters

ABSTRACTCarbon nanoclusters produced by high-repetition-rate laser ablation of graphite and glassy carbon in Ar exhibits para- and ferromagnetic behaviour at low temperature. The results show that the degree of remanent order is strongly dependent on the magnetic history, i.e. whether the samples were cooled under zero-field or field conditions. Such behaviour is typical for a spin glass structure where the system can exist in many different roughly equivalent spin configurations. The spin-freezing temperature is unusually high (50–300 K) compared with ≤ 15 K for typical spin glasses. The maximum in the zero-field magnetic susceptibility experiments and their field dependence indicate that there is competition between ferromagnetic and antiferromagnetic exchange pathways, accounting for the spin glass behavior and/or a low-dimensionality of the system.

scholarly journals Dynamic scaling in spin glasses

2003 ◽  
Vol 68 (5) ◽  
Author(s):  
C. Pappas ◽  
F. Mezei ◽  
G. Ehlers ◽  
P. Manuel ◽  
I. A. Campbell
Keyword(s):  
Spin Glasses ◽  
Dynamic Scaling

LOW FIELD AC MAGNETIC SUSCEPTIBILITY MEASUREMENTS OF MANGANESE ALUMINOSILICATE GLASSES

1991 ◽  
Vol 05 (24n25) ◽  
pp. 1669-1678 ◽  
Author(s):  
MAZHAR U. RANA ◽  
TAHIR ABBAS ◽  
M. ASHRAF CHAUDHRY
Keyword(s):  
Magnetic Susceptibility ◽  
Spin Glass ◽  
Spin Glasses ◽  
Freezing Temperature ◽  
Aluminosilicate Glasses ◽  
Low Field ◽  
Strong Deviation ◽  
Free Ion ◽  
Measuring Frequency ◽  
Mn Concentration

The magnetic susceptibility of MnO.Al2O3.SiO2 spin glasses has been measured over a temperature range of 1.5–150 K using a low-field ac mutual inductance technique. The measuring frequency was 250 Hz with a field of 417 mOe (peak). The Mn concentration varied from 6 to 19 atomic percent (at %). At temperatures above 70 K, the susceptibilities follow a Curie-Wiess behavior with a negative Curie temperature and a Bohr magneton number corresponding nearly to the free ion value of Mn. However, below 70 K all glass samples show strong deviation from the Curie-Wiess behavior (a decrease in 1/χ), culminating in spin glass susceptibility maxima at liquid helium temperature for Mn concentration above 9 at %. These results suggest the formation of antiferromagnetic cluster which grows in size with decreasing temperature and becomes infinitely large as the spin glass freezing temperature is approached.

Sign in / Sign up

Export Citation Format

Share Document