Compensated Coil Magnetometer.

FEATURES MEGAGAUSS - TOULOUSE DRESDEN TOULOUSE
Local Contact

Oleksiy Drachenko

Yurii SKOURSKI

William KNAFO

Field range 0 ... 150 T 0 ... 85 T 0 ... 70 T
Temperature range 4 ... 300 K 1.4 – 270 K
³He option with a base temperature of ~0.4 K is available for magnets A, B, E
1.5 K ... 300 K
Sample size Typically, needle-shaped single crystal sample with
< 1 mm diameter, 2 mm length
(Powder sample is also fine)
(Metallic sample gets a strong effect of eddy currents)
> 1 mm holders are provided in order to mount samples in a defined orientation sample should fit in a 1.4 mm tube, typical sample height = 4 mm, typical mass = 20-40 mg
Typical experiment sweep rates (typical) 300 T/μsec Adiabatic magnetisation Magnetisation M (B)
Raise time 7- 40 ms.
Sensitivity Down to 10-6 J/T (10-3 emu) net magnetic moment.
The sensitivity depends on the shape of the magnetization curve.
suffers from noise since 2012, sensitivity is ok for fields below 40 T, but poor for higher fields, new prototypes are under development
Sample Holder

Sample holder with typical sample inside
Sample is mounted into a kapton tube

Sample environment Gaseous helium from 300K down to 4K Gaseous helium from 270K down to 4K,
liquid helium below
Examples Frustrated magnets
A. Miyata et al., Phys. Rev. B, 87 214424 (2013)
S. Takeyama et al., J. Phys. Soc. Jpn., 81 014702 (2012)
Ultra-robust high-field magnetization plateau in bond-frustrated MnCr2S4 [2].
Y. Skourski et al., Physical Review B 83 214420 (2011)
Tsurkan et al., Sci. Adv. 3, e1601982 (2017)
Heavy Fermions
W. Knafo et al., Nature Comm., 7, 13075 (2016)
K. Kuwahara et al., Phys. Rev. Lett. 110, 216406 (2013)
local contact: O. Drachenko
local contact: Y. Skourski
local contact: W. Knafo