Magneto optic kerr effect magnetometer for ultra-high anisotropy magnetic measurements

摘要

A resistive electromagnet assembly comprises a pair of coils with a gap defined between the coils. The resistive electromagnet assembly is configured to generate a field having a magnetic flux density of at least about 4 Tesla and at a sweep rate to complete a hysteresis loop in less than about 1 minute. A support assembly is configured to support a sample of magnetic material within the gap. An optics module is configured to expose a test region of the magnetic material sample to an optical beam probe while the test region is subjected to the field and to receive a reflected beam from the test region. A processor is coupled to the optics module and configured to measure one or more properties of the magnetic material using the received reflected beam.

主权项

1. An apparatus, comprising:
a resistive electromagnet assembly comprising a pair of coils with a gap defined between the coils, the resistive electromagnet assembly configured to generate a field having a magnetic flux density of at least about 4 Tesla and at a sweep rate to complete a hysteresis loop in less than about 1 minute; a support assembly configured to support a sample of magnetic material having a coercivity of at least 20 kOe within the gap; an optics module configured to expose a test region of the magnetic material sample to an optical beam probe while the test region is subjected to the field and to receive a reflected beam from the test region; and a processor coupled to the optics module and configured to measure one or more properties of the magnetic material using the received reflected beam, the processor further configured to measure the one or more properties at each of a plurality of locations on the sample at a rate of one hundred locations within five minutes.