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Laboratory of Ferromagnetism



Contact person

Prof. Peter Kollár
Email: peter.kollar@upjs.sk
Phone: +421 (055) 234 2529
Address: Park Angelinum 9, 04154 Košice

Experimental facilities

The laboratory of ferromagnetism is equipped with the facilities for recording initial magnetization curves and hysteresis loops of soft magnetic ferromagnetic materials in DC and AC magnetic fields up to 300 kHz. The laboratory is also equipped with the magneto-optical hysteresisgraph enabling to measure hysteresis loops of thin films and surface layers of ferromagnetic material of the thickness of 50 nm in magnetic fields up to 16 kA/m. From the measured hysteresis loops basic parameters of ferromagnetic materials can be evaluated: magnetic induction (polarization) saturation remanent magnetic induction (polarization), coercivity (coercive field) and losses. The laboratory equipment includes a device for measuring the coercivity of soft magnetic materials, working in magnetic fields up to 440 kA /m. An impedance bridge is used to measure the complex permeability magnetically soft ferromagnetic materials in the frequency range 100 Hz - 40 MHz.

Research

The research in the Laboratory of ferromagnetism is focused on the study of magnetization processes in soft magnetic materials at quasi-static magnetic reversal and magnetic reversal in alternating magnetic fields up to 300 kHz.

Offer to professional public

Testing of the magnetic properties of soft magnetic materials. Samples for the measurement may have a shape of ring, ribbon, thin layer, individual sheets and sheets for the Epstein frame.

Photo gallery


KFKL

DC hysteresisgraph for measuring of hysteresis loops, magnetization curves and anhysteresis curves of the samples in the form of rectangular cuboids (sheets, ribbons less than 2 mm thick, less than10 mm wide, 100 - 300 mm long), wire, cylinder and magnetic circuits (ring form samples) or samples joined to the magnetic circuit (for example sheets 30 mm wide and 100 – 300 mm long). Maximum magnetic field depends on the coil constant, maximum current is ±5 A. From measured curves it is possible to calculate the coercivity, saturation, flux density, hysteresis losses, maximum permeability and demagnetization factor.


KFKL

LF AC hysteresisgraph for measuring of hysteresis loops in magnetic field with the frequency up to 50 Hz of the samples in the form of rectangular cuboids (sheets, ribbons less than 2 mm thick, less than 10 mm wide, 100 - 300 mm long), wire, cylinder and magnetic circuits (ring form samples) or samples joined to the magnetic circuit (for example sheets 30 mm wide and 100 – 300 mm long).Maximum magnetic field depends on the coil constant, maximum current is ±5 A. It is possible to calculate coercivity, remanent flux density, permeability and core losses from measured data.


KFKL

Hysteresisgraph (DC and AC)Permeameter AMH-1K-S for measuring hysteresis loops and initial magnetization curves in DC and AC magnetic fields at frequencies up to 1 kHz of samples in the form of magnetic circuits (ring form samples) or samples joined to the magnetic circuit at a given value of maximum flux density or magnetic field. The coercivity, remanence, saturation flux density, total core losses and maximum permeability are calculated from the measured curves.


KFKL

KFKL

LF AC hysteresisgraph from 50 Hz to 1 kHz for measuring of hysteresis loops in AC magnetic fields from 50 Hz to 1 kHz of the samples in the form of magnetic circuits (ring form samples, sheets in Epstein frame) or samples joined to the magnetic circuit (for example sheets 30 mm wide and 100 – 300 mm long). It is possible to calculate coercivity, remanence and core losses.


KFKL

HF AC hysteresisgraph for measuring the hysteresis loops at frequencies from 1 kHz to 300 kHz, enabling to determine core losses, coercive field, remanence and permeability at required value of maximum flux density or magnetic field of ferromagnetic materials in the form of magnetic circuit (for example ring form) and open samples as a part of magnetic circuit.


KFKL

KFKL

Magnetooptical Kerr effect AC hysteresisgraph (MOKE) for measuring of hysteresis of the samples in the form of rectangular cuboids less than 2 mm thick, less than 10 mm wide, 10 mm long (sheets, ribbons) in maximum magnetic field up to 16 kA/m. It is possible to calculate coercivity, relative remanence and relative hysteresis losses.


KFKL

KoerzimatFoerster 1.097 for measuring the coercivity of ferromagnetic materials in magnetic fields up to 440 kA/m.


KFKL

Impedance analyzer Agilent HP4194A for the determination of complex permeability by measuring the impedance in the frequency range 100 Hz - 20 MHz.




Actions


2017-05-18


Otvorenie Relaxačného kútika Mark pre študentov


2017-05-11


Selected topics in magnetism



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Institutions


Pavol Jozef Šafárik University in Košice
Faculty of Science UPJŠ

Departments


Department of Biophysics
Department of Condensed Matter Physics
Department of Nuclear Physics and Subnuclear Physics
Department of Theoretical Physics and Astrophysics
Division of Didactics of Physics

Projects


Establish
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Science on Stage
SCIENCENET
Do not worry physics
Students and teachers at CERN
Discover beauty of physics
Creative physics teacher

Projects


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Moodle
Celim

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