A technique has been devised for precise in situ sample angular positioning and readout in a commercial superconducting quantum interference device (SQUID) susceptometer. The axis of rotation is perpendicular to the applied magnetic field and the temperature range is from 2 K up to room temperature. The technique has an accuracy in angular position of about 0.3%, approximately one degree over one complete rotation. A small coil with an ac current excitation is fixed on the sample stage, and the ac SQUID response is used to determine the angular position of the stage.

1.
Measurements of both longitudinal and transverse components of magnetic moment provide a complete description of the magnetization in a given plane. The measurement has all the information that can be obtained via torque magnetometry, and using a SQUID provides far more sensitivity at fields of a few thousand Oersteds or less.
2.
Quantum Design, 11578 Sorrento Valley Road, Suite 30, San Diego, CA 92121.
3.
I.
Zutic
and
O. T.
Valls
,
Phys. Rev. B
54
,
15
500
(
1996
).
4.
S. K.
Yip
and
J. A.
Sauls
,
Phys. Rev. Lett.
69
,
2264
(
1992
).
5.
J.
Buan
,
B. P.
Stojkovic
,
N. E.
Israeloff
,
A. M.
Goldman
,
O. T.
Valls
,
J.
Liu
, and
R.
Shelton
,
Phys. Rev. Lett.
72
,
2632
(
1994
).
6.
Commercial Plastics and Supply Corporation, 98-31 Jamaica Avenue, Richmond Hill, NY 11418.
7.
California Fine Wire Company, 338-40 S. Fourth St., P.O. Box 446-T, Grover Beach, CA 93483.
8.
J. Clarke, in Superconducting Devices, edited by S. T. Ruggiero and D. A. Rudman (Academic, New York, 1990), p. 51.
9.
R. J. Drago, Fundamentals of Gear Design (Butterworth, Washington, DC, 1988).
This content is only available via PDF.
You do not currently have access to this content.