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| Magnetometry laboratory |
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Polar magnetooptical Kerr-effect |
- Measurement of the polar Kerr-effect
- Magnetic fields up to ± 2T (bipolar power supply)
- Rotation of the sample possible (magnetic field in-plane/out-of-plane/arbitrary angles)
- Signal of a single monolayer of Co easily detectable
- laser spot size: about 1 mm²
- max. sample size: several cm²
Photos: polar setup - polar sample with laserspot
Contact:
M. Farle
J. Lindner
F. M. Römer
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Lock-in based magnetoresistance measurement setup: Microwave irradiated resistance and current induced switching measurements |
- Detection of the resistance change by means of lock-in technique and/or dc measurement
- Possibility to measure the resistance in dependency of the dc current or in dependency of the magnetic field
- Measurement at room temperature with heating possibility (up to 80 °C)
- Measurement geometries: magnetic field perpendicular or parallel to the film plane
- In-plane geometry: magnetic field parallel or transversal to the long wire axis
- Injecting current: ac current (in the range of nA to μA), dc current (in the range of nA to mA) or a combination of both
- Two self-made resistance bridges optimized for low resistances (under 20 Ω) and higher resistances (in the order of kΩ)
- DC resistance measurements for any typical resistance possible
- Possibility of evacuate the sample tube (isolation vacuum of 10-3 mbar)
- Measurement of the temperature near the sample (ΔT = 20 mK)
- Maximum field range: -2 T to +2 T
- Resolution limit: ΔR/R ≈ 10-5
- Usage of 16-pole chip carriers
- Possibility to irradiate microwaves with a semi-rigid cable in the frequency range of 1-20 GHz with powers up to 1 W
Photos: High sensitivity resistance measurement setup - typical measurement
Contact:
M. Farle
J. Lindner
N. Reckers
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