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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

Citation

Kos, A. , Nibarger, J. , Lopusnik, R. , Silva, T. and Celinski, Z. (2003), Cyrogenic pulsed inductive microwave magnetometer, Journal of Applied Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=30913 (Accessed September 23, 2021)
Created May 15, 2003, Updated January 27, 2020