| 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 |
| PDF version: |
 Click here to retrieve PDF version of paper (165KB) |
