Magnetic Properties of Nickel-Iron Alloys Bombarded by Neutrons in a Magnetic Field

Ferromagnetic resonance measurements at 9.5 Gc/sec were made on a number of films of pure iron, pure nickel, and alloys of iron and nickel (Permalloy) before and after 2-MeV 3He-particle irradiation. The 3He particle flux was about 3×1017/cm2 and, during irradiation, the film temperature did not exceed 81°C, as determined by thin-film thermocouples. The resonance field as a function of angle in the film plane, H0(θ), and the half-width, ΔH, were measured at room temperature. In general, H0 decreased (by about 2, 35, and 15 Oe for the iron, Permalloy, and nickel films, respectively) as a result of the irradiation, except for the composition range between 26% and 37% Ni where H0 increased. Also, the half-width generally decreased with irradiation and the half-width change was smallest for compositions around 76% Ni. The changes in H0 were different for films of a given set evaporated onto various substrates (soft glass, fused quartz, single-crystal quartz). Irradiating films in a saturating magnetic field, in the remanent state, and in the demagnetized state gave Hk's which were larger, the larger the magnetic induction of the film during irradiation. Irradiating a film (or reirradiating a previously irradiated film) in a magnetic field also rotated the easy axis of the film into the direction of the field applied during irradiation. The rotation of the easy axis was observed over the entire composition range from pure iron to pure nickel. The variation with composition of the values of Hk after irradiation agrees qualitatively with the values obtained by others using static techniques.

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Some Concepts Concerning the New High-Permeability 50–50 Nickel—Iron Alloys

Kang¹,

Scholefield²,

Martin³

1967

Journal of Applied Physics

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A substantial increase in initial permeability as well as maximum permeability in 53% and 58% nickel—iron alloys after annealing at below the Curie temperature under a magnetic field was obtained. The permeability at 40 G was 38 000, and corresponding maximum permeability was 320 000. The response to magnetic annealing was observed to be dependent on secondary recrystallized textures, of which two kinds were observed. The texture of which the central cube pole of the cube texture rotated around [100] axis parallel to rolling direction showed good response to the magnetic annealing, while the texture of which the central cube pole of the cube texture rotated around [111] axis showed poor response to the magnetic annealing. The percentage increase of the permeability at 40 G is also shown to be dependent on the squareness of the hysteresis loop of specimens before the magnetic annealing. Increase in the permeability at 40 G could be explained by considering the relationship between the induced uniaxial anisotropy and the crystal anisotropy, and also by the reduced magnetostriction.

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Magnetic Properties of Nickel-Iron Alloys Bombarded by Neutrons in a Magnetic Field

Cited by 4 publications

References 4 publications

Chapter 2 Soft magnetic metallic materials

Chapter 2 Soft magnetic metallic materials

Ferromagnetic Resonance of 3He-Irradiated Thin Metal Films

Some Concepts Concerning the New High-Permeability 50–50 Nickel—Iron Alloys

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