Formability and Magnetic Properties of the Binary Nd-Co Amorphous Alloys

In this paper, binary Nd-Co alloys with compositional range from Nd72.5Co27.5 to Nd50Co50 were successfully vitrified into glassy state by a melt-spinning method. The glass formability of the metallic glasses (MGs) was studied and the best glass former in the binary Nd-Co alloys was obtained. Magnetic properties of the MGs were measured. The compositional dependence of Curie temperature of the MGs was observed. The mechanism for the spin-glass-like behaviors and high coercivity at low temperature, and their influence on the magnetic entropy change of the MGs, were investigated.

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Compositional Dependence of Curie Temperature and Magnetic Entropy Change in the Amorphous Tb–Co Ribbons

Materials ◽

10.3390/ma14041002 ◽

2021 ◽

Vol 14 (4) ◽

pp. 1002

Author(s):

Xin Wang ◽

Ding Ding ◽

Li Cui ◽

Lei Xia

Keyword(s):

Curie Temperature ◽

Linear Relationship ◽

Metallic Glasses ◽

Amorphous Alloys ◽

Magnetic Entropy Change ◽

Alloy Composition ◽

Entropy Change ◽

Magnetic Entropy ◽

Compositional Dependence ◽

Curie Temperature Tc

The Curie temperature (Tc) and magnetic entropy change (−ΔSm), and their relationship to the alloy composition of Tb–Co metallic glasses, were studied systematically in this paper. It was found that, in contrast to the situation in amorphous Gd–Co ribbons, the dependence of Tc on Tb content and the maximum −ΔSm vs. Tc -2/3 plots in Tb–Co binary amorphous alloys do not follow a linear relationship, both of which are supposed to be closely related to the non-linear compositional dependence of Tb–Co interaction due to the existence of orbital momentum in Tb.

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Enhanced Curie temperature and magnetic entropy change of Gd50Co50−xNix amorphous alloys

Modern Physics Letters B ◽

10.1142/s0217984920500505 ◽

2019 ◽

Vol 34 (04) ◽

pp. 2050050 ◽

Cited By ~ 1

Author(s):

M. N. Song ◽

L. W. Huang ◽

B. Z. Tang ◽

D. Ding ◽

Q. Zhou ◽

...

Keyword(s):

Magnetic Properties ◽

Amorphous Alloy ◽

Curie Temperature ◽

Binary Alloy ◽

Metallic Glasses ◽

Amorphous Alloys ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Magnetic Entropy ◽

Ni Addition

Small amount of Ni was added in the [Formula: see text] binary alloy to replace the Co element for improving the formability and magnetic properties of the binary amorphous alloy. It was found that the glass formability of the [Formula: see text] amorphous alloy was significantly improved by Ni addition. The Curie temperature [Formula: see text] of the [Formula: see text] metallic glasses decreases with the Ni addition, and the maximum magnetic entropy change [Formula: see text] was also improved. The mechanism for the effect of adding a small quantity of Ni on the [Formula: see text] and [Formula: see text] of the [Formula: see text] amorphous alloy was studied.

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Effect of Co/Ni Substituting Fe on Magnetocaloric Properties of Fe-Based Bulk Metallic Glasses

Metals ◽

10.3390/met11060950 ◽

2021 ◽

Vol 11 (6) ◽

pp. 950

Author(s):

Jia Guo ◽

Lei Xie ◽

Cong Liu ◽

Qiang Li ◽

Juntao Huo ◽

...

Keyword(s):

Metallic Glasses ◽

Amorphous Alloys ◽

Magnetic Entropy Change ◽

Bulk Metallic Glasses ◽

Entropy Change ◽

Magnetic Entropy ◽

Glass Forming ◽

Magnetic Refrigerant ◽

Magnetocaloric Properties ◽

Curie Temperature Tc

In this work, Fe80-xMxP13C7 (M = Co, Ni; x = 0, 5 and 10 at.%) bulk metallic glasses (BMGs) were prepared, and the effect of the Co/Ni elements substitution for Fe on the magnetocaloric properties of Fe80P13C7 BMG has been investigated systematically. The Curie temperature (TC) of the present Fe-based BMGs increases with the substitution of Fe by Co/Ni. The magnetic entropy change (ΔSM) of the present Fe-based BMGs increases first and then decreases with the increase of Fe substituted by Co, but monotonically decreases with the increase of Fe substituted by Ni. Among the present Fe-based BMGs, the Fe75Co5P13C7 BMG exhibits the maximum ΔSM value of 5.21 J kg−1 K−1 at an applied field of 5 T, which is the largest value among Fe-based amorphous alloys without any rare earth elements reported so far. The present Fe-based BMGs exhibit the large glass forming ability, tunable TC and enhanced ΔSM value, which are beneficial for magnetic refrigerant materials.

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Optimization of Soft Magnetic Properties in Fe-B and Fe-B-Si Amorphous Alloys Obtained by Melt Spinning Method

Acta Physica Polonica A ◽

10.12693/aphyspola.102.309 ◽

2002 ◽

Vol 102 (2) ◽

pp. 309-316 ◽

Cited By ~ 2

Author(s):

P. Kwapuliński ◽

Z. Stokłosa ◽

A. Chrobak ◽

J. Rasek ◽

G. Haneczok

Keyword(s):

Magnetic Properties ◽

Amorphous Alloys ◽

Melt Spinning ◽

Soft Magnetic Properties ◽

Soft Magnetic

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Formation, and mechanical and magnetic properties of bulk ferromagnetic Fe-Nb-B-Y-(Zr, Co) alloys

Journal of Materials Research ◽

10.1557/jmr.2006.0126 ◽

2006 ◽

Vol 21 (4) ◽

pp. 1019-1024 ◽

Cited By ~ 18

Author(s):

J.M. Park ◽

J.S. Park ◽

D.H. Kim ◽

J-H. Kim ◽

E. Fleury

Keyword(s):

Magnetic Properties ◽

Saturation Magnetization ◽

Amorphous Alloys ◽

Amorphous Structure ◽

Glass Forming Ability ◽

Partial Replacement ◽

Soft Magnetic ◽

Glass Forming ◽

Mold Casting ◽

Co Alloys

Fe element was partially substituted by Zr and Co in an attempt to enhance the glass-forming ability, and mechanical and soft magnetic properties of Fe74-xNb6B17Y3(Zr, Co)x (x = 3, 5, 8) amorphous alloys. Both partial replacements resulted in the enhancement of the glass-forming ability, and 3-mm diameter rods with a fully amorphous structure were prepared by a copper mold casting method. Zr and Co containing Fe-based bulk amorphous alloys exhibited high compressive fracture strength of about 4 and 3.5 GPa, respectively. However, Zr and Co induced different effects on the magnetic properties. Whereas the partial replacement of Fe by Zr was found to decrease dramatically the saturation magnetization, the partial replacement of Fe by Co provided an increase of about 25% of the saturation magnetization.

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Magnetic properties of the non-stoichiometric TbCo2Nix alloys

EPJ Web of Conferences ◽

10.1051/epjconf/201818504021 ◽

2018 ◽

Vol 185 ◽

pp. 04021

Author(s):

Alexander Inishev ◽

Evgeny Gerasimov ◽

Nikolay Mushnikov ◽

Pavel Terentev ◽

Vasily Gaviko

Keyword(s):

Magnetic Properties ◽

Curie Temperature ◽

Concentration Dependence ◽

Magnetic Moment ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Magnetic Entropy ◽

Thermodynamic Relation ◽

Temperature Dependences

The magnetic and magnetothermal properties of the non-stoichiometric TbCo2Nix (0 ≤ x ≤ 0.2) alloys were studied. It was found that the concentration dependence of the Curie temperature and magnetic moment of the 3d-sublattice have a maximum at x = 0.025. The obtained experimental magnetic properties of the TbCo2Nix alloys were discussed under assumption that the Co magnetic moment in the compounds changes with increasing x. The magnetic entropy change was determined using the temperature dependences of the magnetization and Maxwell’s thermodynamic relation. The obtained results for TbCo2Nix were compared with those for the ErCo2Mnx alloys.

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Influence of Co-Doping on Magnetic Properties and Magnetocaloric Effect of Fe–Co–Zr–Cu–B Melt-Spun Ribbons

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19099 ◽

2021 ◽

Vol 21 (4) ◽

pp. 2552-2557

Author(s):

Nguyen Hai Yen ◽

Nguyen Hoang Ha ◽

Pham Thi Thanh ◽

Nguyen Huy Ngoc ◽

Tran Dang Thanh ◽

...

Keyword(s):

Magnetic Properties ◽

Magnetocaloric Effect ◽

Melt Spinning ◽

Room Temperature ◽

Tangential Velocity ◽

Magnetic Behavior ◽

Entropy Change ◽

Co Doping ◽

Melt Spun ◽

Melt Spun Ribbons

In this work, we investigated magnetic properties and magnetocaloric effect in Fe90−xCoxZr7Cu1B2 (x = 0, 1, 2, 3 and 4) melt-spun ribbons. The ribbons were prepared by using a melt-spinning method with a tangential velocity of a copper wheel of 40 m·s-1. The obtained ribbons are almost amorphous. The alloys exhibit typical soft magnetic behavior with low coercivity at room temperature. A minor replacement of Fe by Co gives an increment in Curie temperature (TC) of the alloys to higher temperatures. The TC of the alloys increases from 242 to 342 K with an increase of x from 0 to 4. Maximum magnetic entropy change, ΔSm max, of the alloys, was found to be larger than 0.7 J·kg-1·K-1 in a magnetic field change ΔH of 12 kOe for all the concentrations of Co. High refrigerant capacitys (RC >100 J ·kg-1 with ΔH = 12 kOe) at room temperature region have been obtained for the alloys. The large magnetocaloric effect near room temperature suggests that the alloys can be considered as magnetic refrigerants in the range of 250–350 K.

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Glassy state formation and magnetic properties of Co-rich ternary RE–Co–B (RE=Y, Tb, Ho) amorphous alloys

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2013.09.059 ◽

2014 ◽

Vol 584 ◽

pp. 477-482 ◽

Cited By ~ 11

Author(s):

Zbigniew Śniadecki ◽

Jozef Marcin ◽

Ivan Škorvánek ◽

Natalia Pierunek ◽

Bogdan Idzikowski

Keyword(s):

Magnetic Properties ◽

State Formation ◽

Amorphous Alloys ◽

Glassy State

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Magnetocaloric Properties of Rapidly Solidified Ni51.1Mn31.2In17.7 Heusler Alloy Ribbons

MRS Proceedings ◽

10.1557/proc-1200-g07-05 ◽

2009 ◽

Vol 1200 ◽

Author(s):

Jose Sánchez Llamazares ◽

Blanca Hernando ◽

Víctor Prida ◽

Carlos García ◽

Caroline Ross

Keyword(s):

Melt Spinning ◽

Magnetic Entropy Change ◽

Magnetic Transition ◽

Entropy Change ◽

Single Step ◽

Magnetic Entropy ◽

Refrigerant Capacity ◽

Magnetocaloric Properties ◽

Room Temperature Magnetic Refrigeration ◽

Rapidly Solidified

AbstractMagnetic entropy change and refrigerant capacity have been determined for a field change of 20 kOe around the second-order magnetic transition of austenite in as-quenched Ni51.1Mn31.2In17.7 alloy ribbons produced by melt spinning technique. Samples crystallize in a single-phase austenite with the highly ordered L21-type crystal structure and a Curie temperature of 275 K. The material shows a maximum magnetic entropy change of ΔSMmax= - 1.7 Jkg-1K-1, an useful working temperature range of 78 K (δTFWHM) and a refrigerant capacity of RC=132 Jkg-1 (RC= │ΔSMmax│ x δTFWHM). The considerable RC value obtained together with the fabrication via a single-step process make austenitic Ni-Mn-In ribbons of potential interest as magnetic refrigerants for room temperature magnetic refrigeration.

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