Saturation magnetostriction and volume magnetostriction of Fe-Ni-Co amorphous ribbons

Jagieliński, T.; Arai, Ken Ichi; Tsuya, N.; Ohnuma, S.; Masumoto, T.

doi:10.1109/tmag.1977.1059635

Cited by 53 publications

(7 citation statements)

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“…The volume magnetostriction, or forced magnetostriction, have been reported for several alloys by Jagielinski (74). In some cases it is large, leading to larger strains than As in moderate fields.…”

Section: Agnetostrictionmentioning

confidence: 84%

“…The absence of data for alloys approach- !ng Ni-only is due to the fact that these alloys are not fe rromagnetic at room temperature. A few measurements of the temperature dependence of As have been reported, with conflicting results (71)(72)(73)(74). Jagielinski et al (74) measured a large number of alloys, and found the temperature variation of As fr om 77-300K to be generally slight, sometimes increasing and sometimes de creasing with temperature.…”

Section: Agnetostrictionmentioning

confidence: 99%

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Magnetic Properties of Amorphous Alloys

Graham¹,

Egami²

1978

Annu. Rev. Mater. Sci.

118

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INTRODUCTIONAmorphous metallic alloys, also known as metallic glasses, can be pre pared by several methods and in a fairly wide range of compositions (1, 2). Almost all the composition� that produce amorphous structures stable at room temperature contain i arge fractions of transition metal or rare earth elements, and many of these are ferromagnetic. In particular, the class of alloys containing about 80 at % of the transition metals Fe, Co, and Ni, and about 20 at % of metalloid or glass-former elements such as B, C, P, and Si, are strongly magnetic at room temperature and offer important opportunities for engineering application (3-8). This review is limited almost entirely to these transition metal based alloys obtained by rapid cooling fr om the melt. The preparation and structure of these alloys are briefly summarized, and the magnetic properties of fundamental and engineering importance are reviewed. COMPOSITIONThe alloys of the class considered here are of the composition T 80M20, where T represents one or more transition metals and M represents one or more metalloid or glass-former elements, usually P, B, C, or Si. Experience indicates that production of the amorphous state is easier (that is, lower cooling rates are sufficient) when both T and M include more than one element. As a consequence, many of the available experimental data concern rather complex compositions. The transition metal content can be varied between about 75 and 85 at %, and the alloys of interest magnetically are those containing mainly Fe, Ni, and Co.The reason for the relative ease of formation of this particular com-423 0084-6600/78/080 1-0423$01.00 Annu. Rev. Mater. Sci. 1978.8:423-457. Downloaded from www.annualreviews.org by Indiana University -Purdue University Indianapolis -IUPUI on 10/05/12. For personal use only. Quick links to online content Further ANNUAL REVIEWS 424GRAHAM & EGAMI position range is not clear, although many possible reasons have been advanced (9, 10). In the relatively few cases where the phase diagram is known, there is a low-melting eutectic at or near the 80-20 composition. The existence of the eutectic means that the liquid state is stable to relatively low temperatures, and suggests that the amorphous state and the crystalline state are not greatly different in energy. Several reasons have been proposed to explain this. One is a geometrical argument based on the fact that 20 at % of small metalloid atoms are approximately sufficient to occupy the open spaces in a densely packed random array of transitional metal atoms, as determined from a hard-sphere model (11). Another is an electronic band-structure argument based on the reduction in the d-e1ectron band energy by amorphous short-range order (12).An additional requirement for the formation and retention of the amorphous structure is that the kinetics of crystallization must be slow. This presumably results from a high value of the activation energy for nucleation, which reflects the substantial surface energy of the boundary layer between the amorph...

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Section: Agnetostrictionmentioning

confidence: 84%

Section: Agnetostrictionmentioning

confidence: 99%

Magnetic Properties of Amorphous Alloys

Graham¹,

Egami²

1978

Annu. Rev. Mater. Sci.

118

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“…The effect, therefore, depends upon the magnetic permeability of the sample and is dependent both on composition and heat treatment. In particular, it can be maximised by the appropriate magnetic annealing which induces anisotropy of desirable orientation and magnitude and at the same time increases the permeability (Tsuya and Arai 1977, Mitchell et a1 1978. The magnitude of the A E effect, defined by where E, and E , are the Young's moduli in the saturated state and demagnetised state, respectively, can theoretically be as large as 10 in Fe base alloys (Spano et a1 1982).…”

Section: Magnetomechanical Coupling and A E Efectmentioning

confidence: 99%

Magnetic amorphous alloys: physics and technological applications

Egami

1984

Rep. Prog. Phys.

224

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Magnetic amorphous alloys obtained by rapid quenching of the melt are excellent soft magnetic materials with a wide range of technological applications. They also represent a significant challenge to the scientific understanding of magnetic materials, since most of the existing theories of solids assume lattice periodicity. For these reasons, the magnetic and other properties of amorphous alloys have been very actively studied over the last decade. In recent years increasing attention has been directed to the fundamental understanding of the structural, thermal and magnetic properties of the amorphous alloys. It is not only scientifically but also technologically important to achieve such an understanding, since the amorphous alloys are, in many respects, so different from conventional crystalline magnetic materials. In this review, we attempt to summarise recent progress in research on magnetic amorphous alloys and critically assess the present level of understanding of this new class of magnetic materials, focusing mostly on the transition-metal-metalloid glasses. We start with a review of early developments and a discussion on the nature of glasses and glass formation and proceed to an extensive discussion of their atomic structure, both from the experimental and theoretical points of view. The questions of glass formation, stability and relaxation are then addressed, followed by a review of their non-magnetic properties. The review of magnetic properties starts with a discussion of the magnetic moment, with the emphasis on the relation between electronic structure and magnetic behaviour. The magnetic interaction, local magnetic anisotropy and magnetoelastic effects are then considered, followed by discussions on magnetic excitation and phase transition, magnetic anisotropy and coercivity, and the effect of structural relaxation. Finally we discuss the prospects of technological applications and the manner in which the basic understanding of these properties could benefit such applications.

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“…In fact, such systems appear to be good examples of weak itinerant ferromagnetism. 2 For example, magnetic studies of some amorphous alloy systems appear to exhibit Invar-like characteristics such as low thermal expansion and large volume magnetostriction. 3 Although a clear picture of the chemical and structural disorder, especially the short-range order, is still lacking, Mossbauer investigations have begun to shed some light as to the influence of amorphous structure on the magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer studies of ferromagnetic metallic glasses under high pressure

Bouzabata

Ingalls

Rao³

1984

Phys. Rev. B

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An investigation of the Mossbauer effect in several ferromagnetic metalhc glasses at high pressure is reported. The amorphous alloys studied were of the form (Fe"Ni& ")M, where M is a combination of the metalloids P, 8, Si, or Al, and x varies from 0.34 to 0.47. In these materials the Curie temperatures were observed to decrease with pressure at a rate varying from -0. 16 to -0.50 K/kbar. Such behavior is consistent with the simpler itinerant models of ferromagnetism at low pressures, but deviates at the higher pressures, possibly due to inhoxnogeneities. The magnetic hyperfine spectra were analyzed by decomposing them into hyperfine field distributions, P(H). The average hyperfine fields and their pressure derivatives, qualitatively, behave similar to crystalline Fe-Ni alloys. Prom the behavior of the pressure dependence of the width of the distributions, one is able to draw some conclusions as to the short-range -versus -long-range nature of the magnetic interactions. The volume dependence of the isomer shifts in these materials suggests an inference as to the near-neighbor coordination of the iron atoms.

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Saturation magnetostriction and volume magnetostriction of Fe-Ni-Co amorphous ribbons

Cited by 53 publications

References 5 publications

Magnetic Properties of Amorphous Alloys

Magnetic Properties of Amorphous Alloys

Magnetic amorphous alloys: physics and technological applications

Mössbauer studies of ferromagnetic metallic glasses under high pressure

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