FeZrN Films: Magnetic and Mechanical Properties Relative to the Phase-Structural State

The paper presents results of investigation of Fe65.3–100Zr34.7–0N7.5–0 films prepared by dc magnetron deposition on glass substrates and subsequent 1-hour annealing at temperatures of 300–600 °C. The influence of the chemical and phase compositions and structure of the films, which were studied by TEM, SEM, XRD, and GDOES, on their mechanical properties determined by nanoindentation and static magnetic properties measured by VSM method is analyzed. The studied films exhibit the hardness within a range of 14–21 GPa, low elastic modulus (the value can reach 156 Gpa), and an elastic recovery of 55–83%. It was shown that the films are strong ferromagnets with the high saturation induction Bs (up to 2.1 T) and low coercive field Hc (as low as 40 A/m). The correlations between the magnetic and mechanical properties, on one hand, and the chemical composition of the films, their phase, and structural states as well, on the other hand, are discussed.

Investigation of the properties of soft magnetic composite materials in the frequency range of harmonic oscillations up to 100 kHz

The dynamic properties of the soft magnetic composite material in the frequency range up to 100 kHz with a change in the thickness of the insulating layer and the size of iron particles were investigated. It is shown that with an increase in the thickness of the insulating layer, the loss for remagnetization decreases, but at the same time there is a decrease in the magnetic value of the saturation induction and magnetic permeability. Therefore, that the decision to reduce losses by increasing the thickness of the insulating coating is not always the best solution. It is preferable to achieve a reduction losses for remagnetization due to an increase in the specific resistance of the insulating layer with its minimum thickness.

Влияние отжига в постоянном магнитном поле на магнитные свойства сплавов железо--галлий

The concentration dependence of the magnetic properties of iron alloys with 3 – 25 at.% gallium has been studied. It is shown that with increasing gallium content, saturation induction decreases monotonically, but coercive force shows a stepped increase with a jump from 85 to 135 A/m between 12 and 15 at.% Ga. The effect of annealing in a dc magnetic field (magnetic field annealing (MFA)) on the behavior of residual induction and coercive force in samples containing from 3 to 18 at.% of gallium was investigated. After the MFA, in the alloy a magnetic anisotropy is induced: magnetic hysteresis loops become narrower, the residual induction increases and the coercive force decreases. The MFA efficiency reaches a maximum when the gallium content is at 15 – 18 at.%. The features of the structural state in iron-gallium alloys and their role in the formation of the magnetic properties during annealing in the dc magnetic field are discussed.

Explaining the d-q Magnetic Couplings Theoretically in Saturated Smooth Air-Gap AC Machines

The current paper discusses the theoretically detailed physical analysis of the effects of main flux saturation in smooth air gap AC machines. For that purpose, three sections are presented. The first one deals for presenting equivalence saturation-air gap. The second presents the equivalence of inductances between saturation induction machines and a dismounted salient pole synchronous machine. The method analyzes the leakage inductances that properly represent the corresponding leakage fluxes. The third section treats the physical interpretation of the cross-saturation. It is possible to show that the equations and physical picture in a saturated smooth-air-gap machine are similar to the equations and physical picture in a non-saturated salient-pole machine, where mutual coupling exists between the direct and quadrature axes and the self-inductances are also different on the non-salient part of the machine due to the variation of the reluctance with the rotor angle.

Ni-Fe Alloys as Perspective Materials for Highly Efficient Magnetostatic Shielding

Magnetostatic shields, based on Ni-Fe alloys, were obtained via electrochemistry method with different thickness of partial magnetic layers. The experimental researches of the magnetic properties and magnetostatic shielding effectiveness of the single-layer and malty-layer cylindrical sample of the shields, based on the electrodeposited Ni80Fe20and Ni50Fe50alloy, are carried out. It has been shown that the shields of gradient type (200 μm Ni50Fe50+200 μm Ni80Fe20and 100 μm Ni50Fe50+300 μm Ni80Fe20), containing layers with different values of saturation induction (Bs), have a higher shielding efficiency than shields of symmetric type (400 μm Ni50Fe50and 400 μm Ni80Fe20). Maximum efficiency of magnetostatic shielding has been noted for 200 μm Ni50Fe50+ 200 μm Ni80Fe20sample. It opens wide prospects for practical application for protection of the microelectronics devices against permanent magnetic fields.

Ni-Fe Alloys as Perspective Materials for Highly Efficient Magnetostatic Shielding

Magnetostatic shields based on Ni-Fe alloys were obtained via electrochemistry method with different thickness of partial magnetic layers. The experimental researches of the magnetic properties and magnetostatic shielding effectiveness of the single-layer and malty-layer cylindrical sample of the shields based on the electrodeposited Ni80Fe20 and Ni50Fe50 alloy are carried out. It has been shown that shields of gradient type (200 μm Ni50Fe50+200 μm Ni80Fe20 and 100 μm Ni50Fe50+300 μm Ni80Fe20) containing layers with different values of saturation induction (Bs) have a higher shielding efficiency than shield of a symmetric type (400 μm Ni50Fe50 and 400 μm Ni80Fe20). Maximum efficiency of magnetostatic shielding has been noted for 200 μm Ni50Fe50+ 200 μm Ni80Fe20 sample. It opens wide prospects for practical application for protection of the microelectronics devices against permanent magnetic fields.