8400 Series HMS

The standard system is capable of DC field measurements and has a resistance range from 0.5 mΩ to 10 MΩ. Measure Hall voltage, Hall coefficient, Hall mobility, and resistivity. With options added, the system allows you to measure down to 0.5 µΩ and as high as 200 GΩ in DC fields. You can also determine carrier density and carrier mobility versus temperature.

For temperature-dependent applications, the 8400 Series options enable you to measure samples from 15 K to 1273 K with a closed-cycle refrigerator and high-temperature oven, or take dedicated 77 K measurements with an optional single-point LN 2 body.
The 8400 Series HMS provides a robust platform that can be configured to meet your specific needs and supports the addition of new features as your material measurement needs evolve. An assortment of options including variable temperature assemblies, high and low resistance, and optical access broaden your measurement opportunities and simplify experimental processes.

Features of the 8400 Series

•Ideal for variable temperature measurement and mobilities from 1 to 106 cm2/V s
•Optional AC field extends mobility measurement range down to 10-3 cm2/V s
•Maximum DC fields to 1.67 T (8404) and 2.25 T (8407)
•Optional AC fields to 1.18 T (8404) and 1.31 T (8407)
•Standard resistance range of 0.5 mΩ to 10 MΩ
•High resistance option widens range to 200 GΩ
•Low resistance option significantly reduces resistance noise floor
•Temperatures from 15 K to 1273 K

		Pole cap (in)	Air gap (in)	DC (T)	AC RMS (T)
Model 8404	At room temperature	2 (standard)	1	1.67	1.18
		4 (optional)	1	1.35	0.95
	With variable temperature option	2 (standard)	2	0.89	0.63
		4 (optional)	2	0.88	0.62
Model 8407	At room temperature	4 (standard)	1	2.10	1.20
		2 (optional)	1	2.25	1.31
	With variable temperature option*	4 (standard)	2	1.45	0.69
		2 in pole caps not recommended for use with variable temperature in the 8407

8400 Series Specifications

	8404		8407
	DC	AC	DC	AC
Measurement specifications
Mobility	1 to 1 × 106 cm2/v s	1 × 10-3 to 1 × 106 cm2/v s	1 to 1 × 106 cm2/v s	1 × 10-3 to 1 × 106 cm2/v s
Carrier concentration density	8 × 102 to 8 × 1023 cm-3		8 × 102 to 8 × 1023 cm-3
Resistivity	1 × 10-5 to 1 × 105 Ω·cm		1 × 10-5 to 1 × 105 Ω·cm
Electronic specifications*
Standard resistance range	±0.5% rdg ±0.5% range: VdP/Hall bar minimum: 0.5 mΩ Maximum: 10 MΩ ±0.075% rdg ±0.05% range: Maximum: 5 MΩ	VdP/Hall bar: 0.5 mΩ to 10 MΩ 300 nV RMS noise floor for sample resistances up to 100 Ω; 500 nV RMS over most of the recommended resistance range above 100 Ω	±0.5% rdg ±0.5% range: VdP/Hall bar minimum: 0.5 mΩ Maximum: 10 MΩ ±0.075% rdg ±0.05% range: Maximum: 5 MΩ	VdP/Hall bar: 0.5 mΩ to 10 MΩ 300 nV RMS noise floor for sample resistances up to 100 Ω; 500 nV RMS over most of the recommended resistance range above 100 Ω
Optional high resistance configuration	±0.25% rdg: VdP/Hall bar minimum: 10 kΩ Maximum: 50 GΩ ±1.5% rdg: Maximum: 100 GΩ ±5% rdg: Maximum: 200 GΩ	VdP/Hall bar: 10 kΩ to 8 GΩ <1250 nV RMS noise floor for sample resistances up to 10 MΩ	±0.25% rdg: VdP/Hall bar minimum: 10 kΩ Maximum: 50 GΩ ±1.5% rdg: Maximum: 100 GΩ ±5% rdg: Maximum: 200 GΩ	VdP/Hall bar: 10 kΩ to 8 GΩ <1250 nV RMS noise floor for sample resistances up to 10 MΩ
Optional low resistance configuration	Resistance Low resistance voltage noise floor <0.1 Ω 5 nV <10 Ω 30 nV <100 kΩ 150 nV For resistance larger than 10 Ω, the voltage noise floor is independent of current for currents less than 1 mA.	NA	Resistance Low resistance voltage noise floor <0.1 Ω 5 nV <10 Ω 30 nV <100 kΩ 150 nV For resistance larger than 10 Ω, the voltage noise floor is independent of current for currents less than 1 mA.	NA
Current	±1 pA to ±100 mA		±1 pA to ±100 mA
Compliance voltage	100 V		100 V
Environment
Room temperature field** (25 mm [1 in] airgap)	1.67 T with standard 50 mm (2 in) pole caps 1.35 T with optional 100 mm (4 in) pole caps	1.18 T with standard 50 mm (2 in) pole caps 0.95 T with optional 100 mm (4 in) pole caps	2.10 T with standard 100 mm (4 in) pole caps 2.25 T with optional 50 mm (2 in) pole caps	1.20 T with standard 100 mm (4 in) pole caps 1.31 T with optional 50 mm (2 in) pole caps
Variable temperature field** (50 mm [2 in] airgap)	0.89 T with standard 50 mm (2 in) pole caps 0.88 T with optional 100 mm (4 in) pole caps	0.63 T with standard 50 mm (2 in) pole caps 0.62 T with optional 100 mm (4 in) pole caps	1.45 T with standard 100 mm (4 in) pole caps	0.69 T with standard 100 mm (4 in) pole caps
Optional AC field frequency ranges	NA	0.05 and 0.1 Hz	NA	0.05 and 0.1 Hz
Sample size	Up to 10 mm × 10 mm × 3 mm standard, up to 50 mm diameter × 3 mm optional		Up to 10 mm × 10 mm × 3 mm standard, up to 50 mm diameter × 3 mm optional
Standard module temperature	Room temperature		Room temperature
Single point LN2 option temperature	77 K point		77 K point
CCR option temperature	15 K to 400 K with standard CCR, 15 K to 350 K with optical CCR		15 K to 400 K with standard CCR, 15 K to 350 K with optical CCR
Oven option temperature	Room temperature to 1,273 K; at 773 K and ±1% rdg: maximum = 1 MΩ; at 1,273 K and ±1% rdg: maximum = 1 kΩ		Room temperature to 1,273 K; at 773 K and ±1% rdg: maximum = 1 MΩ; at 1,273 K and ±1% rdg: maximum = 1 kΩ
Magnet
Pole diameter	4 in		7 in
Pole cap diameter	50 mm (2 in) standard, 100 mm (4 in) optional		100 mm (4 in) standard, 50 mm (2 in) optional
Air gap at room temperature	25 mm (1 in)		25 mm (1 in)
Air gap with variable temperature options	50 mm (2 in)		50 mm (2 in)
Field uniformity	25 mm (1 in) air gap, 50 mm (2 in) pole caps: ±0.35% over 1 cm3 (0.4 in3) 25 mm (1 in) air gap, 100 mm (4 in) pole caps: ±0.05% over 1 cm3 (0.4 in3) 50 mm (2 in) air gap, 100 mm (4 in) pole caps: ±0.15% over 1 cm3 (0.4 in3)		25 mm (1 in) air gap, 50 mm (2 in) pole caps: ±0.35% over 1 cm3 (0.4 in3) 25 mm (1 in) air gap, 100 mm (4 in) pole caps: ±0.05% over 1 cm3 (0.4 in3) 50 mm (25 in) air gap, 100 mm (4 in) pole caps: ±0.15% over 1 cm3 (0.4 in3)
Cooling (magnet and power supply)	7.6 L/min (2 gal/min), 10.3 L/min (2.7 gal/min) with CCR option		19 L/min (5 gal/min), 23 L/min (6 gal/min) with CCR option
3-phase bipolar magnet power supply
Maximum output	±35 V ±70 A (2.5 kW)		±75 V ±135 A  (9.1 kW)
Utilities
Total system cooling water power dissipation (50 or 60 Hz) — see list of available recirculating chillers	4.25 kW; 7.45 kW with optional CCR		13.4 kW; 16.6 kW with optional CCR

*Probe contact resistance may vary with sample
**All field values are nominal and can vary ±1%.

8400 Series measurements

Standard DC Model 84030 AC option VdP Standard with system Can use with AC Hall bar Standard with system Can use with AC High resistance 84031 Can use with AC* Gate bias 84032 Can use with AC Low resistance 84033 -

= included   = Option available (model number)   = Option required (model number) - = Not compatible

*Limits maximum resistance to 8 GΩ