On-chip SQUID measurements in the presence of high magnetic fields

L. Chen, W. Wernsdorfer, C. Lampropoulos, G. Christou, I. Chiorescu

Published 2010-07-21, updated 2010-09-11Version 2

We report a low temperature measurement technique and magnetization data of a quantum molecular spin, by implementing an on-chip SQUID technique. This technique enables the SQUID magnetometery in high magnetic fields, up to 7 Tesla. The main challenges and the calibration process are detailed. The measurement protocol is used to observe quantum tunneling jumps of the S=10 molecular magnet, Mn12-tBuAc. The effect of transverse field on the tunneling splitting for this molecular system is addressed as well.