Laboratory of magnetism and low temperatures
Measuring method:
Magnetometry based on the sample vibration.
Laboratory equipment:
Vibrating sample magnetometer (VSM) Microsense, vector coils for sensitivity to longitudinal and transversal magnetization component, set of sample holders from Pyrex, analytical balance VIBRA HTR-220 CE, desiccator Autostar, Dewars for liquid nitrogen (25 and 35 litres).
Investigated materials:
Solid ferromagnetic and ferrimagnetic materials – thin films, multilayers, bulk magnetic materials, amorphous and nanocrystalline materials based on Fe, Co and Ni; magnetic powders and liquids.
Investigated quantities of materials:
- bulk hysteresis loops and their parameters (coercive, anisotropic and saturation field, saturation and remnant magnetization, permeability, loop area, BHmax, etc.), virgin curves
- vector magnetometry – due to vector coils sensitivity to longitudinal (parallel with magnetic field) and transversal (perpendicular to magnetic field) component magnetization
- analysis of magnetic anisotropy due to rotation of the sample by 400°
- temperature magnetic measurements in the range from -170°C to 720°C, estimation of Curie temperature
- study of magnetic interaction using the Henkel plots
- measurement of magnetic resistance in the range 1mΩ up to 1MΩ at temperatures from -150°C to 400°C
Tab. 1 Technical parameters of vibrating sample magnetometer VSM
Maximal magnetic field | 26 000 Oe at gap 5 mm between pole extensions | ||
24 000 Oe at gap 10 mm between pole extensions | |||
Field resolution and noise | Range | Resolution (Oe) | Noise (rms, Oe) |
32 kOe | 1 | 0,050 | |
3,2 kOe | 0,1 | 0,015 | |
320 Oe | 0,01 | 0,010 | |
32 Oe | 0,001 | 0,004 | |
Magnetic moment | Dynamic range 0,1 μemu – 100 emu | ||
Noise (without loop averaging) 1 μemu at gap 5 mm between pole extensions 1,5 μemu at gap 10 mm between pole extensions | |||
Sample dimensions | Limited in one axis by the gap of pole extensions (min. 5 mm, max. 85 mm), other dimensions unlimited | ||
Temperature measurements | Temperature range from -170°C až 720°C, resolution 0,1°C | ||
Maximal magnetic field 21 000 Oe | |||
Sample dimensions Temperature chamber has the shape of cylinder with inner diameter 10 mm and height 50 mm | |||
Magnetic resistance | Resistor range from 1mΩ až 1MΩ | ||
Temperature range from -150°C až 400°C | |||
Sample dimensions Cuboid: width 3 mm, min. length 10 mm and max. height 3 cm |