Evolution from soft to hard magnetic behavior in Co-based devitrified glassy alloy

Bottoni, G.; Candolfo, D.; Cecchetti, A.

doi:10.1063/1.362276

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…The initial H c values of Co 24 Mo 76 and Co 58 Mo 42 are nearly the same, because the ferromagnetic Co in these two compositions is in amorphous state, which can be detected from the relevant XRD patterns. However, it can be observed that the initial value of M r aM s of the as-deposited Co 24 Mo 76 crystalline alloy is about 0.67 and keeps above 0.5 upon thermal annealing, which matches well with the theoretical calculated value typically for an assembly of randomly oriented particles [16], and confirms that the as-deposited sample is made up of a mixture of crystalline Mo and amorphous Co. In comparison, the initial value of M r aM s of the as-deposited Co 58 Mo 42 sample is about 0.28 and increases sharply to be beyond 0.5 within the temperature range of 200 to 350 C, suggesting that the as-deposited sample was of uniform amorphous Co±Mo alloy.…”

Section: Resultssupporting

confidence: 85%

Amorphous Co–Mo Alloy Films Obtained by Alternate-Deposition

Lin¹,

Chen²,

Liu³

1998

phys. stat. sol. (a)

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The Co±Mo system has a small negative heat of formation (DH f = ± ±7 kJ/mol) and its composition favoring amorphization is limited in a restricted region. In a multilayer scheme, an extra interfacial free energy stored in the films can extend the composition range for forming Co±Mo amorphous alloys. Multilayered films with totally 30 metal layers were designed to have various overall compositions and prepared by alternate-deposition at varying rates and switching times between two depositions. It turned out that amorphous Co±Mo alloy films were indeed formed directly after deposition under appropriate conditions and their composition was in a relatively broadening region from 40 to 82 at% of Co. The calculated Gibbs free energy diagram gives a reasonable interpretation of the observed amorphization as well as the compositional dependence of structural evolution of the formed amorphous Co±Mo alloys upon post-annealing. Besides, the changes of magnetic properties upon post-annealing of the deposited films may also serve as an indirect evidence of the observed structural evolution. The formation of amorphous Co±Mo alloys is attributed to an in-situ interfacial reaction driven by the interfacial free energy together with a utilization of the heats of condensation during vapor-to-solid transition.

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Section: Resultssupporting

confidence: 85%

Amorphous Co–Mo Alloy Films Obtained by Alternate-Deposition

Lin¹,

Chen²,

Liu³

1998

phys. stat. sol. (a)

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“…[4][5][6]), nevertheless, the experimental methods used in the cited works as well a.s the interpretation of the reported results differ in substance from those used in the present work.…”

Section: Introductioncontrasting

confidence: 54%

The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030

et al. 1999

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Co-Fe-Mo-Mn-Si-B metallic glass ribbon (Vitrovac 6030) was subjected to the isothermal annealing at temperatures in the range 523-873 K so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase in the coercivity, exceeding three orders of magnitude, is observed. This increase is interpreted in terms of the strengthening of the pinning effect of the nanocrystalline structure on the moving domain walls. It is shown that the anisotropy of the created crystallites is mainly responsible for the increase in the pinning force since the effective anisotropy seen by the wall becomes larger and larger with the gradual increase in the density and size of the grown particles.

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“…The effect of heat treatment on metastable ferromagnetic alloys is well known and many extended investigations were published from metallic glass discovery up to now [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: -Introductionmentioning

confidence: 99%

Magnetic, magnetoelastic and structural properties of Co82 P18, Fe80B13 Si4C3 and Fe73.5 Cu1Nb3 Si15.5B7 amorphous ribbons after consecutive heat cycles in vacuum

et al. 1998

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Amorphous ferromagnetic ribbons, with basic differences in production technique, in thermal stability and devetrification modality, were investigated to compare some of their magnetic, magnetoelastic and structural properties after repeated annealing cycles in vacuum. In particular, differences in structural relaxation, measured by Differential Scanning Calorimetry, were related to effects on magnetic permeability, magnetoelastic wave amplitude and crystallization occurrence.PACS 81.40 -Treatment of materials and its effects on microstructures and properties. PACS 75.50 -Studies of specific magnetic materials.

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Evolution from soft to hard magnetic behavior in Co-based devitrified glassy alloy

Abstract: Articles you may be interested inHigh-temperature magnetic behavior of soft/soft and soft/hard Fe and Co-based biphase microwires J. Appl. Phys. 116, 093902 (2014); 10.1063/1.4894618 Synthesis of soft/hard magnetic FePt-based glassy alloys with supercooled liquid region J. Appl. Phys.

Cited by 10 publications

References 8 publications

Amorphous Co–Mo Alloy Films Obtained by Alternate-Deposition

Amorphous Co–Mo Alloy Films Obtained by Alternate-Deposition

The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030

Magnetic, magnetoelastic and structural properties of Co82 P18, Fe80B13 Si4C3 and Fe73.5 Cu1Nb3 Si15.5B7 amorphous ribbons after consecutive heat cycles in vacuum

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