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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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- 90 -<br />

MAGNETISATI<strong>ON</strong><br />

ANHYSTERETÎC<br />

INITIAL<br />

FIELD<br />

Figure 8: Magnetisation curves. The initial or normal magnetisation curve is<br />

obtained with an unmagnetised or demagnetised sample as the field<br />

is increased. If the field is then decreased, reversed and cycled<br />

a repeatable but irreversible path is followed. The area inside<br />

this hysteresis loop gives the irreversible energy requirement or<br />

loss. The anhysteretic curve is reversible and is the magnetisation<br />

curve which would be obtained if hysteresis effects were<br />

suppressed. Points on it are obtained, rather similarly to demagnetisation,<br />

by using an alternating field of steadily diminishing<br />

amplitude but superimposed on a steady bias field.

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