The Electromagnetic Sensor unit is working with development of magnetic and electromagnetic sensor systems. We work also with magnetic particles and general magnetic materials, and we help external customers in magnetic characterizing and analyzing their materials. In order to carry out this work we have major laboratory facilities for both static and dynamic magnetic characterization, a magnetically shielded room for low magnetic field and low noise measurements and equipment for microwave measurements. In order to measure static magnetic properties we use a vibrating sample magnetometer (VSM) from LakeShore Ltd. With this instrument we can measure magnetization versus field (hysteresis loops, magnetization and demagnetization curves) and magnetization versus time (measurement of long relaxations of for instance thermally blocked magnetic nanoparticles). The maximum magnetic field in the VSM is 2 T and with a magnetic moment resolution of 1 nAm2.
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With the vibrating sample magnetometer (VSM) in our magnetic lab we can measure magnetic properties of various magnetic materials. | In order to measure dynamic magnetic properties we use a magnetic multi instrument from Oxford Instruments Ltd. (MagLab EXA). With this instrument we can measure magnetic dynamic properties from a few Hz up to 10 kHz (magnetic moment resolution of about 0.01 nAm2 at 1 kHz) and also static magnetic measurements can be performed with this instrument with fields up to 9 T (superconducting magnet and cryostat is included in the instrument). We have also built a sensitive instrument that is able to detect dynamic magnetic properties of general magnetic materials (powder, liquids, solids and films) up to 250 kHz. In the unit we also work with different applications of magnetoelastic resonance and therefore we have built an experimental setup to detect this resonance, where we can vary, the excitation amplitude, bias field and excitation frequency in both pulse mode and continuous frequency sweep.
We have also equipment for microwave measurements (for instance reflection parameters of different materials) up to 85 GHz.
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In our magnetically
shielded room we can
carry out ultrasensitive
magnetic measurements. |
In our lab we have also a magnetic shielded room where we can
achieve a shielding factor of about 1300 at DC. In this room we can perform low magnetic field and low noise measurements for instance with SQUIDs (Superconducting QUantum Inteference Device) or other magnetic measurements that require low external fields. |