Absence of a “ferromagnet-spin glass” reentrant phase transition in quasi-two-dimensional ferromagnetic systems with competing exchange interactions

JETP Letters ◽  
1997 ◽  
Vol 65 (2) ◽  
pp. 166-170 ◽  
Author(s):  
G. A. Takzei ◽  
Yu. P. Grebenyuk ◽  
I. I. Sych ◽  
L. M. Kulikov
Keyword(s):  
Phase Transition ◽  
Spin Glass ◽  
Exchange Interactions ◽  
Two Dimensional

Dipole–dipole interactions as the source of spin-glass behaviour in exchangewise two-dimensional ferromagnetic layer compounds

1990 ◽  
Vol 68 (10) ◽  
pp. 1134-1137 ◽  
Author(s):  
D. G. Rancourt ◽  
G. Lamarche ◽  
P. Tume ◽  
A. E. Lalonde ◽  
P. Biensan ◽  
...  
Keyword(s):  
Spin Glass ◽  
Elevated Temperatures ◽  
Ferromagnetic Layer ◽  
Exchange Interactions ◽  
Layered Materials ◽  
Model Systems ◽  
Temperature Hysteresis ◽  
Two Dimensional ◽  
Ferromagnetic Exchange ◽  
Spin Glass Behaviour

We have studied magnetic layered materials that have in-plane ferromagnetic exchange interactions, and dipole–dipole only interplane interactions. These are biotite mica (including a nearly ideal annite end member) and new graphite bi-intercalation compounds that contain regularly stacked arrays of ferromagnetic and diamagnetic intercalates. All these strictly (exchangewise) two-dimensional materials exhibit hysteretic spin-glass magnetization cusps at temperatures up to 42 K. This proves that, in the presence of ferromagnetic correlations, classical dipole–dipole forces can play an important role in causing spin-glass behaviour at elevated temperatures. The layered materials described are ideal model systems for the study of a class of spin glasses that require only ferromagnetic exchange interactions. Below some characteristic temperature TFC, the latter interactions induce ferromagnetic correlations that give rise to significant dipole–dipole coupling leading to "domain configuration trapping" and an onset of temperature hysteresis at T ~ TFC.

scholarly journals Non-collinear ground state and stable bimerons from four-spin chiral interactions in D3h magnet

2021 ◽  
Vol 2015 (1) ◽  
pp. 012118
Author(s):  
G R Rakhmanova ◽  
A N Osipov ◽  
D I Ilin ◽  
I V Shushakova ◽  
I V Iorsh
Keyword(s):  
Phase Transition ◽  
Ground State ◽  
Magnetic Order ◽  
Point Group ◽  
Exchange Interactions ◽  
Two Dimensional ◽  
Magnetic Ground State ◽  
Magnetic Vortices ◽  
Spin Interactions ◽  
Magnetic Skyrmions

Abstract We demonstrate that four-spin interactions in crystals with D3h point group of symmetry can cause a phase transition from a collinear state to a non-collinear magnetic ground state (such as magnetic vortices or magnetic skyrmions), while all anti-symmetric chiral terms are forbidden by symmetry in such crystals. Moreover, D3h point group rather common among two dimensional magnets. Taking into account possible four-spin chiral exchange interactions is important for understanding noncollinear magnetic order in these systems. We also address a possible stabilization of bimerons by the same contribution.

Temperature Effect on the Two-Dimensional Phase Transition Kinetics of Adenine Adsorbed at the Hg Electrode/Aqueous Solution Interface

2003 ◽  
Vol 68 (8) ◽  
pp. 1407-1419 ◽  
Author(s):  
Claudio Fontanesi ◽  
Roberto Andreoli ◽  
Luca Benedetti ◽  
Roberto Giovanardi ◽  
Paolo Ferrarini
Keyword(s):  
Phase Transition ◽  
Aqueous Solution ◽  
Phase Change ◽  
Temperature Effect ◽  
Transition Rate ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Solution Interface ◽  
Phase Transition Kinetics ◽  
Kinetics Of

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

scholarly journals Quantum effects on the BKT phase transition of two-dimensional Josephson arrays

2000 ◽  
Vol 61 (17) ◽  
pp. 11289-11292 ◽  
Author(s):  
Alessandro Cuccoli ◽  
Andrea Fubini ◽  
Valerio Tognetti ◽  
Ruggero Vaia
Keyword(s):  
Phase Transition ◽  
Quantum Effects ◽  
Two Dimensional ◽  
Josephson Arrays ◽  
Bkt Phase Transition
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