Influence of cryogenic temperature on magnetic properties of soft magnetic composites

Abstract

Magnetic properties of Fe based composite materials with different particle sizes under a cryogenic condition have been investigated. Realisation of this venture has been carried out at the liquid nitrogen temperature. Results of energy loss density were obtained from measurements of the static (dc) hysteresis cycles ranging from 0·1 to 1·0 T. In turn, results of power loss density were obtained from measurements of the dynamic (ac) hysteresis cycles ranging from 50 to 1000 Hz and at the maximum flux density of 0·5, 0·8 and 1·0 T. The study confirmed the influence of temperature on magnetic parameters. It has been shown that total power loss density has increased with decreasing temperature. We report changes in a nature of energy loss after immersing specimens made of soft magnetic composites in liquid nitrogen. Measurements of the maximum relative permeability were also conducted.

Modelling Hysteresis Loops in Fe-Based Soft Magnetic Composites Using Takács Description

“…The magnetization process in these materials takes place through the movement of magnetic walls and rotation of the magnetization vector and it is dominated by the rst component. On the other hand, in the materials with a small size of particle (smaller than 100 µm), the rotation of the magnetization vector plays a dominant role [14,15]. The obtained results conrm mentioned above the physical relations of magnetization process.…”

Catalytic Reaction Intensification by a Novel Cryogenic Auxiliary Synthesized Fe-PAN Membrane

“…During electrospinning, the low temperature can reduce the intensity of molecular motion and reduce the disorderly collision between molecules, thus enhancing the magnetic property of the nanometal. , The increase in magnetic property leads to increased repulsion between nanometals and is conducive to more uniform metal dispersion inside the fiber. , Additionally, low temperature also improves the conductivity of polymers and thus improves the entrapment rate of nanometals . To confirm the NZVI dispersion in Fe-PAN, the average crystallite sizes D (nm) of NZVI were calculated by the Scherrer formula D = K γ B .25em cos ⁡ θ where K is the Scherrer constant (0.89), γ is the X-ray wavelength (0.154056 nm), B is the half-peak width (in radians form), and θ (°) is the diffraction angle.…”

“…During electrospinning, the low temperature can reduce the intensity of molecular motion and reduce the disorderly collision between molecules, thus enhancing the magnetic property of the nanometal. 36,37 The increase in magnetic property leads to increased repulsion between nanometals and is conducive to more uniform metal dispersion inside the fiber. 38,39 Additionally, low temperature also improves the conductivity of polymers 40 and thus improves the entrapment rate of nanometals.…”

The Influence Of The Temperature Of Liquid Nitrogen On The Physical Properties Of Powder Magnetic Composites

“…The magnetocrystalline anisotropy will increase at lower temperatures, meaning, that a higher field is needed to reach a given magnetization level. A consequence of this phenomenon is an increase in magnetization energy losses [6]. Table 1.…”