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Publication Citation: Cyrogenic pulsed inductive microwave magnetometer

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Author(s): Anthony B. Kos; John P. Nibarger; Radek Lopusnik; Thomas J. Silva; Zbigniew J. Celinski;
Title: Cyrogenic pulsed inductive microwave magnetometer
Published: May 15, 2003
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
Pages: pp. 7068 - 7070
Keywords: coplanar waveguide;cryogenic;cryopump;magnetic dynamics;magnetic thin films;microwave magnetometer;pulsed inductive;switching dynamics
Research Areas: Electromagnetics
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