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I noticed differences when comparing definitions between 1938 and the present. Looking at the definitions for diamagnetic, paramagnetic and ferromagnetic
Notably that copper used to be classed para-magnetic but today is diamagnetic. Note that diamagnetic materials used to diminish the magnetic field, bismuth as an example.
1938 Diamagnetic
and those which act in the opposite way – that is, diminish the strength of a magnetic field when placed in it. ......Bismuth is such a material.
Diamagnetic today
metals have a very weak and negative susceptibility to magnetic fields. Diamagnetic materials are slightly repelled by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Diamagnetic materials are solids with all paired electron resulting in no permanent net magnetic moment per atom. Diamagnetic properties arise from the realignment of the electron orbits under the influence of an external magnetic field. Most elements in the periodic table, including copper, silver, and gold, are diamagnetic.
1938 Para-magnetic
Substances which show magnetic properties to a very slight degree ... materials such as the ordinary non-magnetic metals, copper, aluminium
Paramagnetic today
metals have a small and positive susceptibility to magnetic fields. These materials are slightly attracted by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron orbits caused by the external magnetic field. Paramagnetic materials include magnesium, molybdenum, lithium, and tantalum.
1938 Ferromagnetic
The substances such as iron, steel and nickel, which show magnetic properties strongly when subject to a magnetising force are called ferromagnetic.
Today Ferromagnetic
materials . Iron, nickel, and cobalt are examples of ferromagnetic materials. Components with these materials are commonly inspected using the magnetic particle method.
I noticed differences when comparing definitions between 1938 and the present. Looking at the definitions for diamagnetic, paramagnetic and ferromagnetic
Notably that copper used to be classed para-magnetic but today is diamagnetic. Note that diamagnetic materials used to diminish the magnetic field, bismuth as an example.
1938 Diamagnetic
and those which act in the opposite way – that is, diminish the strength of a magnetic field when placed in it. ......Bismuth is such a material.
Diamagnetic today
metals have a very weak and negative susceptibility to magnetic fields. Diamagnetic materials are slightly repelled by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Diamagnetic materials are solids with all paired electron resulting in no permanent net magnetic moment per atom. Diamagnetic properties arise from the realignment of the electron orbits under the influence of an external magnetic field. Most elements in the periodic table, including copper, silver, and gold, are diamagnetic.
1938 Para-magnetic
Substances which show magnetic properties to a very slight degree ... materials such as the ordinary non-magnetic metals, copper, aluminium
Paramagnetic today
metals have a small and positive susceptibility to magnetic fields. These materials are slightly attracted by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron orbits caused by the external magnetic field. Paramagnetic materials include magnesium, molybdenum, lithium, and tantalum.
1938 Ferromagnetic
The substances such as iron, steel and nickel, which show magnetic properties strongly when subject to a magnetising force are called ferromagnetic.
Today Ferromagnetic
materials . Iron, nickel, and cobalt are examples of ferromagnetic materials. Components with these materials are commonly inspected using the magnetic particle method.