Cryogenic pulsed inductive microwave magnetometer

Autor:	Thomas J. Silva, Radek Lopusnik, Zbigniew Celinski, John P. Nibarger, Anthony B. Kos
Rok vydání:	2003
Předmět:	Materials science Electromagnet business.industry Magnetometer Coplanar waveguide Analytical chemistry General Physics and Astronomy Cryopump Cryogenics Magnetic field law.invention law Optoelectronics Vacuum chamber business Microwave
Zdroj:	Journal of Applied Physics. 93:7068-7070
ISSN:	1089-7550 0021-8979
Popis:	A cryogenic pulsed inductive microwave magnetometer is used to characterize the switching dynamics in thin-film magnetic materials at low temperatures and microwave frequencies. The system is contained inside a 20-cm-diam 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 in the sample 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7ff8f727dbee76ac1efa4ff7df303068 https://doi.org/10.1063/1.1543125 Zobrazit plný text záznamu