7 Tesla SQUID Magnetometer
(NSF DMR-0113714)
The Result of the Month
(January 2003)
Magnetic properties of manganin
E. Cizmar1, J.-H. Park1, M. W. Meisel1, M. Orendáč2
1
2
Department of Physics, University of Florida
Institute of Physics, P.J. Šafárik University, Košice, Slovakia
0.00020
8
0.010
0.00016
0.00014
 [emu/g]
0.00012
7
0.008
0.006
6
0.004
5
0.002
0.000
0
0.00010
50
100
150
200
250
300
T [K]
0.00008
ZFC
FC 1kG
0.00006
M [emuG/g]
 [emuK/g]
0.00018
4
3
2
1
0.00004
0
0.00002
0.00000
-1
0
50
100
150
200
250
300
0
1
T [K]
2
3
4
5
6
7
8
6
H [10 G]
Fig. 1. Magnetic susceptibility of the field-cooled (FC) Fig. 2. Field dependence of magnetization of the
and zero field-cooled (ZFC) sample measured in polycrystalline sample at 5 K.
temperature range from 2 to 300 K with H = 1 kG.
The manganin alloy (82% Cu, 12% Mn, 4% Ni) is often used for wiring in cryogenic apparatus because
of small change of the electric resistance in the low temperature region. Due to the high concentration
of magnetic ions, the contribution of manganin itself might be important in magnetic measurements or
in experiments involving applied magnetic fields. Previous studies of diluted CuMn alloys showed
spin-glass behavior in these systems [1-3]. In addition, the manganin shows spin-glass behavior with
freezing temperature at about 60 K. The magnetization from 0 to 70 kG shows a S-shape type of curve,
typical for spin-glass materials.
Supported by the NSF through INT-0089140 and DGE-0209410
[1] G.E. Brodale et al., JMMM 31-34 (1983), 1331.
[2] P.J. Ford et. al, Phys. Rev. B 14 (1976) 2057.
[3] C.A.M. Mulder et al., Phys. Rev. B 23 (1981) 1384.
Questions or Suggestions e-mail me cizmar@phys.ufl.edu