Related Experiment Video
Updated: Dec 30, 2025

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
Published on: February 8, 2018
Anomalous magnetic properties in LaFe11.5Al1.5
Sanjay Sharma1, Faizan Ahmad1, Ankit Singh1
1Spintronics and Magnetic Materials Laboratory, Department of Applied Sciences, IIIT Allahabad, Prayagraj 211012, India. pkumar@iiita.ac.in.
Abstract:
We report the magnetic relaxation, DC magnetization, heat capacity, and X-ray powder diffraction studies of a melt-spun LaFe11.5Al1.5 compound executed across a temperature range of 5 to 300 K. We have found three magnetic transitions (at temperatures T1, T2, and Tord) in this compound in the zero-field cooled (ZFC) mode, and two magnetic transitions (at T2 and Tord) in the field-cooled cooling/warming (FCC/FCW) mode. The ferromagnetic transition (FM) at temperature T2 indicating hysteresis alludes to a magnetic transition of the first-order (FOT) at lower temperatures. The magnetization study reveals that meta-stable states exist in the low-temperature antiferromagnetically ordered state. Partially reversible behaviour is also observed in the 120-140 K temperature range. The heat capacity data indicates that the magnetic state of this compound is clearly different from that of spin glasses. The magnetocaloric properties of the compound are determined in the form of the isothermal magnetic entropy change (SM) and the adiabatic temperature change (ΔTad) and the utmost values of SM and Tad for a field variation of 25 kOe observed were 3.1 J kg-1 K-1 and 1.12 K respectively. The relative cooling power (RCP) is ascertained to be 216 J kg-1 for an enforced field of 25 kOe.
More Related Videos
Related Concept Videos
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Ferromagnetism
Diamagnetism
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....
Magnetic Susceptibility and Permeability
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...
Paramagnetism
Valence Bond Theory

