Related Experiment Video
Updated: May 30, 2026
09:43
Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
Published on: November 7, 2017
Hysteresis in the antiferromagnetic random-field Ising model at zero temperature.
Lobisor Kurbah1, Prabodh Shukla
1Physics Department, North Eastern Hill University, Shillong, India.
Summary
We investigated hysteresis in the antiferromagnetic random-field Ising model at zero temperature. Exact 1D solutions for uniform and Gaussian random fields match numerical simulations, revealing hysteresis loop behavior.
Area of Science:
- Condensed Matter Physics
- Statistical Mechanics
- Magnetism
Background:
- Hysteresis is a key phenomenon in magnetic systems.
- Antiferromagnetic materials exhibit complex magnetic ordering.
- Random-field models are crucial for understanding disordered magnetic systems.
Purpose of the Study:
- To analyze hysteresis in the antiferromagnetic random-field Ising model at zero temperature.
- To compare exact one-dimensional solutions with numerical simulations.
- To investigate the impact of different random field distributions on hysteresis.
Main Methods:
- Adiabatic cycling of an external magnetic field between -∞ and ∞.
- Exact determination of the hysteresis loop in one dimension.
- Numerical simulations of the antiferromagnetic random-field Ising model.
- Consideration of uniform and Gaussian random field distributions.
Main Results:
- The hysteresis loop was precisely determined for both uniform and Gaussian random field distributions.
- Exact one-dimensional results were found to be in agreement with numerical simulations.
- The study provides a detailed characterization of hysteresis in this specific model.
Conclusions:
- The study successfully characterized hysteresis in the antiferromagnetic random-field Ising model.
- Agreement between analytical and numerical methods validates the findings.
- The results offer insights into the behavior of disordered magnetic systems.
More Related Videos
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
08:55Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Related Concept Videos
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
01:30Paramagnetism
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
01:23Atomic Nuclei: Nuclear Relaxation Processes
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...
01:31Magnetic Susceptibility and Permeability
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
01:26Diamagnetism
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.