Gauss (unit)

The term emu is short for ‘electromagnetic unit’ and is not a unit in the conventional sense. It is sometimes used as a magnetic moment (1 emu = 1 erg G−1) and sometimes takes the dimensions of volume (1 emu = 1 cm3). is measured in emu mol−1.

1. If you want convert emu/g to A/m, you can multiply the value M in emu/g with the density in g/cm3, then the M is changed to the value in emu/cm3 or emu/cc. Because 1 emu/cc = 1000 A/m, so you can get the M in A/m by multiply 1000. 2.

All Answers (22) Dear Aseya, there is no need for a reference. Just consider that your magnetometer measures the total magnetic moment of your sample in units of erg/G (EMU). If you divide this value by mu_B = 9.2741 × 10^(−21) erg/G you get the total number of Bohr magnetons of your sample.

The magnetic moment of electron is approximately equal to one Bohr magneton and the value of one Bohr magneton is equal to 9.274 × 10–24J/T. Here, A is area of the circular loop. Thus, value of Bohr magneton is equal to 9.274 × 10–24J/T.

1.3047 K

Curie point, also called Curie Temperature, temperature at which certain magnetic materials undergo a sharp change in their magnetic properties. In the case of rocks and minerals, remanent magnetism appears below the Curie point—about 570 °C (1,060 °F) for the common magnetic mineral magnetite.

The above graph represents that at the Curie Temperature, the paramagnetic properties still exist as the magnetization is zero (because of the absence of a magnetic field)….Here are the Curie Temperatures for a Few Ferromagnetic Substances.

According to the Curie’s Law, the magnetization which is present in a paramagnetic material is said to be directly proportional to the applied field of magnetic. If the object which we have used is heated then the magnetization is viewed to be temperature which is inversely proportional.

When it is heated, the relation is reversed i.e. the magnetization becomes inversely proportional to temperature. χ = C/T. This relationship is defined as the Curie’s law. The constant ‘C’ is called the curie constant.

Curie temperature is the temperature above which the magnetic materials lose their ferromagnetic properties. Above the curie temperature, random thermal motions cause misalignment of the dipoles.

Most of ferromagnetic substances have a relatively high Curie temperature – for nickel the Curie temperature is about 360 °C, iron 770 °C, cobalt 1121 °C.

450°C

Magnetostriction is a property of ferromagnetic materials that causes them to change their shape when subjected to a magnetic field. The effect was first identified in 1842 by James Joule when observing a sample of nickel. This effect can cause losses due to frictional heating in susceptible ferromagnetic cores.

two types

Magnetostriction can be defined as the change in dimension of a piece of magnetic material induced by a change in its magnetic state. Generally, a magnetostrictive material changes its dimension when subjected to a change of the applied magnetic field.

Copper is a ferromagnetic material. Ferromagnetic substances are strong magnetic materials that exhibit strong magnetism in the direction of the field.

An iron rod placed in a magnetic field directed along its length stretches slightly in a weak magnetic field and contracts slightly in a strong magnetic field. Mechanically stretching and compressing a magnetized iron rod inversely produces fluctuations in the magnetization of the rod.