Magnetic properties and pressure effect on the curie temperature of Fe-Nd and Fe-Nd-B amorphous alloys

Abstract In this paper, the results of investigations are presented, into the microstructure and magnetic properties of the following amorphous alloys in the as-quenched state: Fe82Zr7Nb2Cu1B8 and Fe86Zr4Y3Nb1Cu1B5. The studied material was produced in the form of thin ribbons of 3 mm width and 20 μm thickness. The structure and microstructure of the samples have been investigated by means of Mössbauer spectrometry and X-ray diffractometry. In addition, the magnetic properties of these materials have been determined, i.e. the low-field magnetic susceptibility, and the magnetisation as a function of temperature and magnetising field. On the basis of the performed investigations, it has been found that a minor change in the quantities of elements favouring amorphisation, such as: Zr and Y, has an influence on the value of the Curie temperature and the magnetic properties of the resulting alloys. It should be noticed that the changes, introduced in the chemical composition of the alloys, don’t change the combined volume of these elements, i.e. Zr7 and Zr4Y3.

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Pressure effect on the curie temperature and thermal expansion anomaly in Fe-Nd and Fe-Nd-B amorphous alloys

High Pressure Research ◽

10.1080/08957958908201685 ◽

1989 ◽

Vol 1 (3) ◽

pp. 193-201 ◽

Cited By ~ 6

Author(s):

K. Fukamichi ◽

H. Komatsu ◽

T. Masumoto ◽

T. Kaneko ◽

K Shirakawa ◽

...

Keyword(s):

Thermal Expansion ◽

Curie Temperature ◽

Amorphous Alloys ◽

Pressure Effect

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The Effect of Pressure on Magnetic Properties of Prussian Blue Analogues

Crystals ◽

10.3390/cryst9020112 ◽

2019 ◽

Vol 9 (2) ◽

pp. 112 ◽

Cited By ~ 6

Author(s):

Maria Zentkova ◽

Marian Mihalik

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Curie Temperature ◽

Prussian Blue ◽

High Spin ◽

Pressure Effect ◽

Spin Transition ◽

Applied Pressure ◽

Effect Of Pressure ◽

Prussian Blue Analogues

We present the review of pressure effect on the crystal structure and magnetic properties of Cr(CN)6-based Prussian blue analogues (PBs). The lattice volume of the fcc crystal structure space group Fm 3 ¯ m in the Mn-Cr-CN-PBs linearly decreases for p ≤ 1.7 GPa, the change of lattice size levels off at 3.2 GPa, and above 4.2 GPa an amorphous-like structure appears. The crystal structure recovers after removal of pressure as high as 4.5 GPa. The effect of pressure on magnetic properties follows the non-monotonous pressure dependence of the crystal lattice. The amorphous like structure is accompanied with reduction of the Curie temperature (TC) to zero and a corresponding collapse of the ferrimagnetic moment at 10 GPa. The cell volume of Ni-Cr-CN-PBs decreases linearly and is isotropic in the range of 0–3.1 GPa. The Raman spectra can indicate a weak linkage isomerisation induced by pressure. The Curie temperature in Mn2+-CrIII-PBs and Cr2+-CrIII-PBs with dominant antiferromagnetic super-exchange interaction increases with pressure in comparison with decrease of TC in Ni2+-CrIII-PBs and Co2+-CrIII-PBs ferromagnets. TC increases with increasing pressure for ferrimagnetic systems due to the strengthening of magnetic interaction because pressure, which enlarges the monoelectronic overlap integral S and energy gap ∆ between the mixed molecular orbitals. The reduction of bonding angles between magnetic ions connected by the CN group leads to a small decrease of magnetic coupling. Such a reduction can be expected on both compounds with ferromagnetic and ferrimagnetic ordering. In the second case this effect is masked by the increase of coupling caused by the enlarged overlap between magnetic orbitals. In the case of mixed ferro–ferromagnetic systems, pressure affects μ(T) by a different method in Mn2+–N≡C–CrIII subsystem and CrIII–C≡N–Ni2+ subsystem, and as a consequence Tcomp decreases when the pressure is applied. The pressure changes magnetization processes in both systems, but we expect that spontaneous magnetization is not affected in Mn2+-CrIII-PBs, Ni2+-CrIII-PBs, and Co2+-CrIII-PBs. Pressure-induced magnetic hardening is attributed to a change in magneto-crystalline anisotropy induced by pressure. The applied pressure reduces saturated magnetization of Cr2+-CrIII-PBs. The applied pressure p = 0.84 GPa induces high spin–low spin transition of cca 4.5% of high spin Cr2+. The pressure effect on magnetic properties of PBs nano powders and core–shell heterostructures follows tendencies known from bulk parent PBs.

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Pressure effect on thermal relaxation behavior of the Curie temperature in amorphous alloys

Journal of Applied Physics ◽

10.1063/1.345320 ◽

1990 ◽

Vol 67 (8) ◽

pp. 3655-3660 ◽

Cited By ~ 5

Author(s):

Zhong‐Yi Shen ◽

Jing‐Xin Hong ◽

Xiu‐Jun Yin ◽

Yun Zhang ◽

Shou‐An He

Keyword(s):

Curie Temperature ◽

Amorphous Alloys ◽

Pressure Effect ◽

Thermal Relaxation ◽

Relaxation Behavior

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PRESSURE EFFECT ON THE MAGNETIC PROPERTIES OF Fe-La AMORPHOUS ALLOYS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19888524 ◽

1988 ◽

Vol 49 (C8) ◽

pp. C8-1143-C8-1144

Author(s):

T. Goto ◽

C. Murayama ◽

N. Mori ◽

H. Wakabayashi ◽

K. Fukamichi ◽

...

Keyword(s):

Magnetic Properties ◽

Amorphous Alloys ◽

Pressure Effect

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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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