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Cyrogenic pulsed inductive microwave magnetometer

Published

Author(s)

Anthony B. Kos, John P. Nibarger, Radek Lopusnik, Thomas J. Silva, Zbigniew J. Celinski

Abstract

A cryogenic pulsed inductive microwave magnetometer is used to characterize the switching dynamics in thin-film materials at low temperatures and microwave frequencies. The system is contained inside a 20-cm-dia ultrahigh vacuum chamber and cooled by a cryopump that allows measurements between 20 and 350 K. A temperature controller regulates the sample temperature using two silicon diodes as sensors. Applied magnetic fields of up to 36 kA/m (450 Oe) are generated by a four-pole, water-cooled electromagnet with independent control of each axis. Magnetic switching is driven by high-speed current step pulses in a coplanar waveguide structure with the sample placed in a flip-chip configuration. A 20 GHz sampling oscilloscope is used to record the dynamics of the magnetic reorientation. The switching dynamics are given for a 10-nm thick Ni-Fe film at 30 K in response to a 1 kA/m field step.
Citation
Journal of Applied Physics
Volume
93
Issue
10

Keywords

coplanar waveguide, cryogenic, cryopump, magnetic dynamics, magnetic thin films, microwave magnetometer, pulsed inductive, switching dynamics
Created May 15, 2003, Updated February 19, 2017