scholarly journals Interplay between symmetric exchange anisotropy, uniform Dzyaloshinskii-Moriya interaction, and magnetic fields in the phase diagram of quantum magnets and superconductors

2010 ◽  
Vol 81 (14) ◽  
Author(s):  
Ion Garate ◽  
Ian Affleck
Keyword(s):  
Phase Diagram ◽  
Magnetic Fields ◽  
Exchange Anisotropy ◽  
Quantum Magnets ◽  
Moriya Interaction

scholarly journals Heisenberg Model with Added Dzyaloshinskii-Moria Interaction

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
M. R. Soltani ◽  
J. Vahedi ◽  
M. R. Abolhassani ◽  
A. A. Masoudi
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Magnetic Fields ◽  
Ground State ◽  
Heisenberg Model ◽  
Uniform Magnetic Field ◽  
Quantum Phase Transitions ◽  
Ground State Phase Diagram ◽  
Moriya Interaction

We have considered the 1D spin-(1/2) Heisenberg model with added Dzyaloshinskii-Moriya interaction. The effect of a uniform magnetic field on the ground state phase diagram of the model is studied. We have mapped the model to an effective model which is known as the 1D XXZ in both uniform and staggered magnetic fields. By selecting a block of two or three spins, we have solved the Hamiltonian exactly. Our results show that the quantum phase transitions can be obtained from the block of pair or three spins.

ANISOTROPIC VORTEX DYNAMICS AND PHASE DIAGRAM OF YBa2Cu3O7 SINGLE CRYSTALS WITH CANTED COLUMNAR DEFECTS

1996 ◽  
Vol 10 (22) ◽  
pp. 2723-2743 ◽  
Author(s):  
D. S. REED ◽  
N.-C. YEH ◽  
W. JIANG ◽  
U. KRIPLANI ◽  
M. KONCZYKOWSKI ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Magnetic Fields ◽  
Vortex Dynamics ◽  
Flow Model ◽  
Flux Flow ◽  
Thermally Activated ◽  
Liquid Transition ◽  
Columnar Defects ◽  
Thermally Activated Flux Flow ◽  
Activated Flux

The anisotropic vortex dynamics and phase diagram are determined for a YBa 2 Cu 3 O 7 single crystal with columnar defects oriented at ±7.5° relative to the crystalline c-axis. A second-order splayed-glass to vortex-liquid transition is manifested for magnetic fields nearly parallel to the columns via the critical scaling of vortex AC and DC transport properties. In contrast, for magnetic fields aligned close to the ab-plane, an XY-like vortex-glass transition prevails. For magnetic fields at intermediate angles, there is no evidence of any vortex phase transition, and the vortex dynamics is described in terms of the thermally activated flux flow model.

scholarly journals Information storage in permalloy modulated magnetic nanowires

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Guidobeth Sáez ◽  
Pablo Díaz ◽  
Eduardo Cisternas ◽  
Eugenio E. Vogel ◽  
Juan Escrig
Keyword(s):  
Magnetic Material ◽  
Phase Diagram ◽  
Magnetic Fields ◽  
Domain Walls ◽  
Wire Diameter ◽  
Information Storage ◽  
Magnetic Nanowires ◽  
The Wire ◽  
The Stability ◽  
Cylindrical Wire

AbstractA long piece of magnetic material shaped as a central cylindrical wire (diameter $$d=50$$ d = 50 nm) with two wider coaxial cylindrical portions (diameter $$D=90$$ D = 90 nm and thickness $$t=100$$ t = 100 nm) defines a bimodulated nanowire. Micromagnetism is invoked to study the equilibrium energy of the system under the variations of the positions of the modulations along the wire. The system can be thought of as composed of five independent elements (3 segments and 2 modulations) leading to $$2^5=32$$ 2 5 = 32 possible different magnetic configurations, which will be later simplified to 4. We investigate the stability of the configurations depending on the positions of the modulations. The relative chirality of the modulations has negligible contributions to the energy and they have no effect on the stability of the stored configuration. However, the modulations are extremely important in pinning the domain walls that lead to consider each segment as independent from the rest. A phase diagram reporting the stability of the inscribed magnetic configurations is produced. The stability of the system was then tested under the action of external magnetic fields and it was found that more than 50 mT are necessary to alter the inscribed information. The main purpose of this paper is to find whether a prototype like this can be complemented to be used as a magnetic key or to store information in the form of firmware. Present results indicate that both possibilities are feasible.

scholarly journals Universal properties of highly frustrated quantum magnets in strong magnetic fields

2007 ◽  
Vol 33 (9) ◽  
pp. 745-756 ◽  
Author(s):  
O. Derzhko ◽  
J. Richter ◽  
A. Honecker ◽  
H.-J. Schmidt
Keyword(s):  
Magnetic Fields ◽  
Quantum Magnets ◽  
Strong Magnetic Fields ◽  
Universal Properties
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