scholarly journals Field- and Stress-Induced Magnetic Anisotropy in Nanocrystalline Fe-Based and Amorphous Co-Based Alloys

1999 ◽  
Vol 32 (1-4) ◽  
pp. 289-294
Author(s):  
V. A. Lukshina ◽  
N. V. Dmitrieva ◽  
A. P. Potapov
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Amorphous Alloy ◽  
Magnetic Anisotropy ◽  
Thermomechanical Treatment ◽  
Nanocrystalline Alloy ◽  
Complex Effect ◽  
Induced Magnetic Anisotropy ◽  
The Magnetic Field

For nanocrystalline alloy Fe73.5Cu1Nb3Si13.5B9 thermomechanical treatment was carried out simultaneously with nanocrystallizing annealing (1) or after it (2). It was shown that a change in magnetic properties for the case 1 is essentially greater than for the case 2. Complex effect of thermomagnetic and thermomechanical treatments on magnetic properties was studied in the above-mentioned nanocrystalline alloy as well as in the amorphous alloy Fe5Co70.6Si15B9.4., During the annealings both field and stress were aligned with the long side of the specimens. It was shown that the magnetic field, AC or DC, decreases an effect of loading. Moreover, the magnetic field, AC or DC, applied after stress-annealing can destroy the magnetic anisotropy already induced under load.

scholarly journals Influence of Various Heat Treatments on Giant Magnetoimpedance Effect in Nanocrystalline FeSiBNbCu Ribbons

1999 ◽  
Vol 32 (1-4) ◽  
pp. 269-279 ◽  
Author(s):  
G. V. Kurlyandskaya ◽  
M. Vázquez ◽  
E. H.C.P. Sinnecker ◽  
A. P. Zhukov ◽  
J. P. Sinnecker ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Zero Field ◽  
Fixed Frequency ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
X Ray ◽  
Induced Magnetic Anisotropy ◽  
Magnetostriction Constant

In this paper we present studies on the frequency dependence of the magneto-impedance in the range of 0.1–2 MHz for Fe73.5Si13.5B9Nb3Cu1 and Fe73.5Si16.5B6Nb3Cu1 nanocrystalline ribbons, which differ in the sign of the magnetostriction constant. As cast samples were annealed in Ar atmosphere at 560℃, with and without an DC and AC magnetic field. At a fixed frequency, an improvement in the field annealed 13.5% Si samples, when compared with the zero field annealed ones, can be observed. On the 16.5% Si field annealed samples only a reduction of magneto-impedance ratio could be observed, when compared to the non-field annealed ones. Analysis of the magnetic properties and X-ray data shows that the observed changes in magneto-impedance effect are consequence of the induced magnetic anisotropy.

The Magnetic Anisotropy of Rubber

1946 ◽  
Vol 19 (2) ◽  
pp. 349-350
Author(s):  
Eugenie Cotton-Feytis
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Electric Field ◽  
Magnetic Anisotropy ◽  
Air Gap ◽  
Silk Thread ◽  
Rubber Ring ◽  
Set Up ◽  
Possible Cause ◽  
The Magnetic Field

Abstract In experiments on the magnetic properties of some crystals, one of these cystals was suspended between the poles of a small electromagnet. These poles were flat and of the same diameter as the cores (5 cm.), while the air gap varied from 1.5 to 4 cm. and the field at the center from 8800 to 5500 gauss units. The crystal was suspended by a silk thread with very slight twist and a small rubber ring cut from a piece of gas tubing. It was observed that, as soon as the electric field was set up, the assembly oriented itself strongly, and the couple exceeded the magnitude which was expected. It was observed also that this couple continued when the crystal was removed and only the rubber ring remained as a possible cause of the phenomenon. The same phenomenon is observed with a ring of paramagnet rubber and with a ring of diamagnetic rubber, whether the rubber is supple or whether it has become brittle, and whether the ring is perfect or whether it has a cut in it. Instead of flat rings, longer sections of tubing, e.g., 2 to 3c m. long, can be suspended in the magnetic field. It is then particularly surprising to observe that the pieces of tubing always orient themselves axially in the magnetic field, whereas under the same conditions elongated isotropic substances orient themselves in this way only if they are paramagnetic.

The Magnetic Anisotropy of Stretched Rubber as a Function of the Tension to Which It Is Subjected

1945 ◽  
Vol 18 (1) ◽  
pp. 8-9 ◽  
Author(s):  
Eugénie Cotton-Feytis
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Uniaxial Crystal ◽  
Horizontal Magnetic Field ◽  
First Approximation ◽  
The Difference ◽  
The Times ◽  
Angular Displacements ◽  
The Magnetic Field ◽  
Oscillation Method

Abstract From the standpoint of its magnetic anisotropy, stretched rubber is comparable in a first approximation to a uniaxial crystal, in which the direction of the axis is the same as the direction of elongation. It is possible to measure this anisotropy by means of the oscillation method used by Krishnan, Guha and Banerjee in studying crystals. The sample to be examined is suspended in a uniform horizontal magnetic field in such a manner that its axis is horizontal. It is then so arranged that the torsion of the suspension wire is zero when the rubber sample is in a position of equilibrium in the field. The times of oscillation T′ and T for very small angular displacements around this position, in the presence and then in the absence of the magnetic field, are then recorded. In this way the difference between the specific susceptibilities in the direction of the axis and in the horizontal direction perpendicular to the axis is calculated by application of the equation:

Magnetic Properties and Structure of the Alloy Fe63.5Ni10Cu1Nb3Si13.5B9 with Induced Magnetic Anisotropy

2021 ◽  
Vol 122 (6) ◽  
pp. 533-539
Author(s):  
V. A. Lukshina ◽  
N. V. Dmitrieva ◽  
E. G. Volkova ◽  
D. A. Shishkin
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Induced Magnetic Anisotropy

scholarly journals Thermal Stability of Field- and Stress-Induced Anisotropy in Nanocrystalline Fe-Based and Amorphous Co-Based Alloys

1999 ◽  
Vol 32 (1-4) ◽  
pp. 281-287 ◽  
Author(s):  
N. V. Dmitrieva ◽  
V. A. Lukshina ◽  
G. V. Kurlyandskaya ◽  
A. P. Potapov
Keyword(s):  
Thermal Stability ◽  
Magnetic Anisotropy ◽  
Amorphous Alloys ◽  
Nanocrystalline Alloy ◽  
Induced Anisotropy ◽  
External Effects ◽  
Nanocrystalline And Amorphous ◽  
Induced Magnetic Anisotropy ◽  
Stress Induced Anisotropy ◽  
Thermal Stability Of

Thermal stability of induced magnetic anisotropy (IMA) was studied in a course of subsequent annealings without any external effects for already field- or stress-annealed specimens of the nanocrystalline Fe73.5Cu1Nb3Si13.5B9 and amorphous Fe3Co67Cr3Si15B12 alloys. For these alloys the dependence of IMA thermal stability on the magnitude of the IMA constant (Ku) and temperature of stress-annealing was investigated. For the nanocrystalline alloy thermal stability of field- and stress-induced anisotropy with identical Ku was compared. It was shown that nanocrystalline specimens with identical Ku values after field- or stress-annealing have identical thermal stability of IMA. This can point to a similarity of the mechanisms of IMA formation after field- or stress-annealings. Thermal stability of stress-induced anisotropy in the nanocrystalline alloy with Ku value less than 1000 J/m3 and the amorphous alloy with Ku less than 100 J/m3 depends on the value of Ku. For both stress-annealed nanocrystalline and amorphous alloys magnetic anisotropy induced at higher temperatures is more stable because more long-range and energy-taking processes take place at these temperatures.

Induced magnetic anisotropy and strain in permalloy films deposited under magnetic field

2012 ◽  
Vol 520 (18) ◽  
pp. 5981-5984 ◽  
Author(s):  
Eon Byeong Park ◽  
Sung-Uk Jang ◽  
Ji-Hong Kim ◽  
Soon-Ju Kwon
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Induced Magnetic Anisotropy
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