ZapperZ said:A SQUID device built right onto the material?
Zz.
Petar Mali said:Suppose that antiferromagnetic material have two sublattice. How can we measure magnetisation in sublattice A and in sublattice B? Maybe neutron scattering? How that work? Is NMR good solution maybe?
Magnetisation in antiferromagnetics is measured by using techniques such as neutron scattering, magnetic force microscopy, and Kerr microscopy. Neutron scattering involves directing a beam of neutrons at the material and measuring the deflection of the neutrons due to the magnetic properties of the material. Magnetic force microscopy uses a tiny magnetized probe to scan the surface of the material and measure the magnetic forces. Kerr microscopy measures the changes in the polarization of light reflected off the surface of the material, which is affected by the magnetic properties.
The main difference between measuring magnetisation in antiferromagnetics and ferromagnetics is that antiferromagnetics have a net magnetisation of zero, while ferromagnetics have a net magnetisation in a specific direction. This means that different techniques are required to measure the magnetic properties of these materials.
Yes, the magnetisation in antiferromagnetics can be controlled and manipulated. This is typically done by applying an external magnetic field, which can change the alignment of the antiferromagnetic domains and therefore change the net magnetisation. Other methods, such as using spin-polarized currents, can also be used to manipulate magnetisation in antiferromagnetics.
Interpreting the results of magnetisation measurements in antiferromagnetics can be more complex than in ferromagnetics. This is because antiferromagnetics have multiple domains with different orientations, and the net magnetisation is usually zero. Therefore, the results must be carefully analyzed to determine the magnetic properties of the material, such as the strength of the antiferromagnetic coupling and the orientation of the domains.
There are some limitations to measuring magnetisation in antiferromagnetics, such as the sensitivity of the measurement techniques and the difficulty in controlling the direction of the magnetic field. Additionally, the results can be affected by the size and shape of the sample, as well as the temperature and other external factors. Further research and advancements in measurement techniques are needed to overcome these limitations and improve our understanding of antiferromagnetic materials.