Enhanced soft magnetic properties and magnetocaloric effect in B substituted amorphous Fe–Zr alloy ribbons

Mishra, Debabrata; Gurram, Mallikarjuna; Reddy, A.K.; Perumal, A.; Saravanan, P.; Srinivasan, A.

doi:10.1016/j.mseb.2010.07.038

Cited by 54 publications

(23 citation statements)

References 41 publications

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“…They observed that the increase of T C is proportional to the increase in the average Fe-Fe distance, which allowed them to conclude that the dominant cause of the T C enhancement of amorphous Fe 93 Zr 7 upon doping is a volume effect. Similar effects were found for amorphous Fe 89−x B x Zr 11 (x = 0−10) alloys prepared by melt spinning where the Curie temperature and RT saturation magnetization increase almost linearly with B addition [42]. Also, an enhancement of FM was observed in Fe-rich amorphous Fe-Zr ribbons by hydrogen absorption [43].…”

Section: Introductionsupporting

confidence: 67%

Influence of the critical Fe atomic volume on the magnetism of Fe-rich metallic glasses evidenced by pressure-dependent measurements

et al. 2016

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Despite the intensive studies for decades, it is still not well understood how qualitatively different magnetic behaviors can occur in a narrow composition range for the Fe-rich Fe-transition metal (TM) amorphous alloys. In this study of amorphous Fe 100−x Zr x (x = 7, 9, 12) metallic glasses, normal ferromagnetism (FM) is found at 12 % Zr where only the FM-paramagnetic (PM) transition is observed at the Curie temperature, T C . In contrast, spin-glass (SG)-PM transition at a temperature, T g , called SG temperature, is only observed at 7 % Zr, while in the transient re-entrant composition range (x = 8−11), an SG-FM transition at a temperature, T f , called spin-freezing temperature, is also observed at low temperature besides the normal FM-PM transition at T C . In order to understand this unusual behavior, a detailed characterization of pressure (atomic volume), composition, and temperature dependence of the magnetic properties is coupled with high pressure synchrotron x-ray diffraction determination of the pressure dependence of the atomic volume. The results on Fe 100−x Zr x (x = 7, 9, 12) are compared to those obtained for the FM Co 91 Zr 9 metallic glass not showing any kind of anomalous magnetic properties. It is confirmed that the unusual behavior is caused by a granularlike magnetic structure where weakly coupled magnetic clusters are embedded into a FM bulk matrix. Since the mechanism of the magnetization reversal was found to be of the curling type rather than homogeneous rotation, the energy barrier determining the blocking temperature of the clusters is calculated as AR, where A is the exchange constant and R is the cluster size, in contrast to the usual characterization of the energy barrier by KV where K is the anisotropy energy and V is the cluster volume. The volume fraction of the FM part is a fast changing function of the bulk composition: Almost 100% FM fraction is found at 12 % of Zr while no trace of real FM is observed at 7 at % Zr. The driving force of this surprising magnetic character is the atomic volume: The lower the Zr content, the higher is the fraction of Fe atoms with compressed atomic volume having low magnetic moment. The percolation of their network separates the clusters from the FM bulk. The complex magnetic behavior of the Fe-rich Fe-Zr amorphous system at low temperatures can thus be interpreted with the only assumption of a cluster-size distribution and a weak coupling of the clusters to the FM matrix. The introduction of this coupling is able to explain the opposite pressure dependence of T g and T f . The threshold atomic volume in the low magnetic moment regions is found to be comparable to the atomic volume characteristic to the low-spin limit of the face-centered-cubic Fe alloys. The extensive literature results on the anomalous magnetism for various Fe-rich Fe-TM amorphous alloys and especially for the Fe-rich Fe-Zr glassy system are also found to be in agreement with this granular magnetic behavior.

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Section: Introductionsupporting

confidence: 67%

Influence of the critical Fe atomic volume on the magnetism of Fe-rich metallic glasses evidenced by pressure-dependent measurements

et al. 2016

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“…For example, the Curie temperature of Fe 90-x Y x Zr 10 alloy is increased from 225 K (for x = 0) to 395 K (for x = 10) with increasing the concentration of Y [5]. Both the saturation magnetization (M s ) and Curie temperature of the FeZr-B alloy is increased with a slight increase of B-concentration [8], while those of the Fe 90-…”

Section: Introductionmentioning

confidence: 96%

“…One of the most typical materials is amorphous alloys. Among amorphous alloys, Fe-Zr based rapidly quenched alloys are of particular interests as they have giant magnetocaloric effect (GMCE), broad S m peak around the Curie temperature T C , low coercivity, high resistivity, no toxicity and low price [5][6][7][8][9]. For example, the Curie temperature of Fe 90-x Y x Zr 10 alloy is increased from 225 K (for x = 0) to 395 K (for x = 10) with increasing the concentration of Y [5].…”

Section: Introductionmentioning

confidence: 99%

MAGNETIC PROPERTIES AND MAGNETOCALORIC EFFECT OF Fe90-xPrxZr10 RAPIDLY QUENCHED ALLOYS

Hà¹

2018

JST

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In this paper, we present the results of studying magnetic properties and magnetocaloric effect of Fe 90-x Pr x Zr 10 (x = 1, 2 and 3) rapidly quenched alloys. The alloy ribbons with thickness of about 15 µm were prepared by melt-spinning method on a single roller system. X-ray diffraction patterns of the ribbons manifest their almost amorphous structure. Thermomagnetization measurements show that the Curie temperature of the alloys can be controlled to be near room temperature by changing concentration of Pr (x). When the concentration of Pr is increased, saturation magnetization of the alloys increased from 48 emu/g (with x = 1) to 66.8 emu/g (with x = 2). All the ribbons reveal soft magnetic behavior with low coercive force (H c < 42 Oe). The magnetic entropy change of the alloys, |∆S m | max > 0.9 J.kg -1 K -1 in magnetic field change H = 12 kOe, shows large magnetocaloric effect at phase transition temperature. On the other hand, the working temperature range is quite large ( FWHM ~ 70 K) revealing an application potential in magnetic refrigeration technology of these alloys.

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“…Among this type of GMCE material, Fe-Zr based alloys have attracted the attention of many scientists. [16][17][18][19][20][21][22] To improve glass forming ability (GFA) and change in Curie temperature (T C ) of the Fe-Zr alloy, other elements such as Mn, Co, Ni, Y, and B have been added. However, the effect of the additional elements on the GFA and T C of the alloy is widely various.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the Curie temperature of the Fe 90Àx Mn x Zr 10 system is decreased from $210 K (for x = 8) to $185 K (for x = 10) with increasing Mn concentration, 16 while that of the Fe 89Àx B x Zr 11 alloys is increased from $310 K (for x = 2.5) to $370 K (for x = 10) with increasing B concentration. 18 In addition to the effort of enhancing the RC at room temperature for Fe-Zr based alloys, studies on the magnetic mechanism are also necessary for this alloy system. In this work, we investigate the influence of Dy concentration on the magnetocaloric effect and critical behavior in Fe-Dy-Zr alloys prepared by using the meltspinning method.…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect and Critical Behavior in Fe-Dy-Zr Rapidly Quenched Alloys

Dan

Yen

Thanh

2016

Journal of Elec Materi

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In this paper, we present our study results for Fe 90Àx Dy x Zr 10 (x = 1-6) alloy ribbons with thickness of about 15 lm prepared by using a melt-spinning technique. Structure and magnetic properties of the ribbons were investigated by using x-ray diffraction analysis and magnetization measurements, respectively. The results show that the alloy is almost amorphous with x = 1, but partly crystalline with x ‡ 2, i.e. the glass forming ability (GFA) of the alloy is reduced with an increase of the Dy-concentration. Curie temperature, T C , of the alloy is considerably increased, from 273 K (for x = 1) to 305 K (for x = 3), by increasing the Dy-concentration. Maximum magnetic entropy change, |DS m | max , of the alloys with x = 1 and 2 was respectively determined to be 0.84 and 0.93 J kg À1 K À1 with magnetic field change DH = 12 kOe. High refrigerant capacity (RC > 80 J kg À1 ) at room temperature region has been obtained for the alloy revealing its possibility for practical application in magnetic refrigeration. Critical analyses around the ferromagnetic-paramagnetic phase transitions, by using the Arrott-Noakes method, indicate longrange ferromagnetic orders in the alloys.

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Enhanced soft magnetic properties and magnetocaloric effect in B substituted amorphous Fe–Zr alloy ribbons

Cited by 54 publications

References 41 publications

Influence of the critical Fe atomic volume on the magnetism of Fe-rich metallic glasses evidenced by pressure-dependent measurements

Influence of the critical Fe atomic volume on the magnetism of Fe-rich metallic glasses evidenced by pressure-dependent measurements

MAGNETIC PROPERTIES AND MAGNETOCALORIC EFFECT OF Fe90-xPrxZr10 RAPIDLY QUENCHED ALLOYS

Magnetocaloric Effect and Critical Behavior in Fe-Dy-Zr Rapidly Quenched Alloys

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