Random magnetic anisotropy studies in nanocrystalline Pr2Co7Hx (0 ≤ x ≤ 3.75) hydrides

Yamkane, Z.; Fersi, R.; Rachid, F.Z.; Moubah, R.; Lassri, H.; Mliki, N.; Bessaïs, L.

doi:10.1016/j.jmmm.2017.10.015

Cited by 17 publications

(7 citation statements)

References 17 publications

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“…These relationships are supported by previous studies in refs. [35,36], which establish theoretical links between these factors. The in‐depth analysis of these parameters makes it possible to obtain a more detailed understanding of the microscopic mechanisms governing the magnetic properties of the films studied.…”

Section: Resultsmentioning

confidence: 99%

“…Using the model of random magnetic anisotropy described in reference, [ 35 ] we deduced the saturation magnetization MS by applying the saturation approach law: [ 36 ]

$$M \left(\right. H \left.\right) = M_{\text{s}} \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

“…Using the model of random magnetic anisotropy described in reference, [35] we deduced the saturation magnetization MS by applying the saturation approach law: [36]…”

Section: Magnetic Characteristics Study Of Random Magnetic Anisotropy...mentioning

confidence: 99%

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Exploration of the Magnetic Properties of ZrCo:Co Bilayer Films: Effects of the Thickness of the Co Layer on the Anisotropy and Magnetic Interaction Parameters

Fersi,

Apolo Palarizato

2024

Physica Status Solidi (a)

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The analysis of ZrCo:Co films with varying Co layer thicknesses reveals distinctive magnetic properties and behaviors. Despite significant roughness, the films exhibit uniform surfaces and complete crystallization at the nanoscale. Magnetic studies show positive remanence anisotropy, decreased coercivity Hc and remanent magnetization Mr with increasing film thickness, along with a linear correlation between thickness and surface roughness. Exchange interactions between grains and layers influence magnetic properties. Ferromagnetic resonance analysis demonstrates a direct correlation between film thickness and magnetization orientation preference, notably at δCo = 200 nm. These findings underscore the critical role of film thickness in determining microstructural and magnetic properties, offering insights for magnetic device and nanotechnology applications. Understanding these relationships may lead to thickness‐tunable magnetic materials. This study uniquely explores ZrCo:Co films, delving into how their magnetic properties vary with Co layer thickness, revealing novel magnetic behaviors.

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Section: Resultsmentioning

confidence: 99%

“…Using the model of random magnetic anisotropy described in reference, [ 35 ] we deduced the saturation magnetization MS by applying the saturation approach law: [ 36 ]

$$M \left(\right. H \left.\right) = M_{\text{s}} \left(\right.

…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Exploration of the Magnetic Properties of ZrCo:Co Bilayer Films: Effects of the Thickness of the Co Layer on the Anisotropy and Magnetic Interaction Parameters

Fersi,

Apolo Palarizato

2024

Physica Status Solidi (a)

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“…Hydrogen atoms (H) were inserted into the Pr 2 Co 7 compound with a solid-gas reaction between the sample and 99.99% pure dihydrogen (H 2 ) [58]. The method used was that of Sievert [62,63].…”

Section: Synthesis Methods Ofmentioning

confidence: 99%

“…This method, which constitutes a non-equilibrium synthesis process, makes it possible to obtain metastable nanostructured powders from a mixture of elementary powders. We tailored the mean field theory (MFT) [56,57] and random magnetic anisotropy (RMA) [58,59] to investigate the magnetic moments, exchange interactions, and magnetic anisotropy properties. The correlation between microstructure and magnetic properties is discussed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Chemical Substitution and Light Element Insertion on the Magnetic Properties of Nanocrystalline Pr2Co7 Compound

2022

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It is well recognized that intermetallics based on rare-earth (R) and transition metals (T) display numerous interesting magnetic properties, leading to potential applications in different fields. The latest progress regarding magnetic properties and the magnetocaloric effect (MCE) in the nanostructured Pr2Co7 compound, as well as its carbides and hydrides, is reviewed in this paper. Some of this progress reveals remarkable MCE performance, which makes it attractive in the field of magnetic refrigeration at high temperatures. With the purpose of understanding the magnetic and magnetocaloric characteristics of these compounds, the crystal structure, microstructure, and magnetism are also brought into focus. The Pr2Co7 compound has interesting magnetic properties, such as a high Curie temperature TC and uniaxial magnetocrystalline anisotropy. It crystallizes in a hexagonal structure (2:7 H) of the Ce2Ni7 type and is stable at relatively low temperatures (Ta≤ 1023 K), or it has a rhombohedral structure (2:7 R) of the Gd2Co7 type and is stable at high temperatures (Ta≥ 1223 K). Studies of the magnetocaloric properties of the nanocrystalline Pr2Co7 compound have shown the existence of a large reversible magnetic entropy change (ΔSM) with a second-order magnetic transition. After its substitution, we showed that nanocrystalline Pr2Co7−xFex compounds that were annealed at Ta = 973 K crystallized in the 2:7 H structure similarly to the parent compound. The extended X-ray absorption fine-structure (EXAFS) spectra adjustments showed that Fe atoms preferably occupy the 12k site for x ≤ 1. The study of the magnetic properties of nanocrystalline Pr2Co7−xFex compounds revealed an increase in TC of about 26% for x = 0.5, as well as an improvement in the coercivity, Hc (12 kOe), and the (BH)max (9 MGOe) product. On the other hand, the insertion of C atoms into the Pr2Co7 cell led to a marked improvement in the TC value of 21.6%. The best magnetic properties were found for the Pr2Co7C0.25 compound annealed at 973 K, Hc = 10.3 kOe, and (BH)max = 11.5 MGOe. We studied the microstructure, hydrogenation, and magnetic properties of nanocrystalline Pr2Co7Hx hydrides. The crystal structure of the Pr2Co7 compound transformed from a hexagonal (P63/mmc) into an orthorhombic (Pbcn) and monoclinic (C2/c) structure during hydrogenation. The absorption of H by the Pr2Co7 compound led to an increase in the TC value from 600 K at x = 0 to 691 K at x = 3.75. The Pr2Co7H0.25 hydride had optimal magnetic properties: Hc = 6.1 KOe, (BH)max = 5.8 MGOe, and TC = 607 K. We tailored the mean field theory (MFT) and random magnetic anisotropy (RMA) methods to investigate the magnetic moments, exchange interactions, and magnetic anisotropy properties. The relationship between the microstructure and magnetic properties is discussed. The obtained results provide a fundamental reference for adapting the magnetic properties of the Pr2Co7, Pr2Co6.5Fe0.5, Pr2Co7C0.25, and Pr2Co7H0.25 compounds for potential permanent nanomagnets, high-density magnetic recording, and magnetic refrigeration applications.

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Crystal structure, morphology and magnetic properties of nanocrystalline Zr$$_{6}$$Fe$$_{23}$$ thin films grown on Si(001) substrate

Fersi

Dalia

2022

Appl. Phys. A

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Random magnetic anisotropy studies in nanocrystalline Pr2Co7Hx (0 ≤ x ≤ 3.75) hydrides

Cited by 17 publications

References 17 publications

Exploration of the Magnetic Properties of ZrCo:Co Bilayer Films: Effects of the Thickness of the Co Layer on the Anisotropy and Magnetic Interaction Parameters

Exploration of the Magnetic Properties of ZrCo:Co Bilayer Films: Effects of the Thickness of the Co Layer on the Anisotropy and Magnetic Interaction Parameters

Influence of Chemical Substitution and Light Element Insertion on the Magnetic Properties of Nanocrystalline Pr2Co7 Compound

Crystal structure, morphology and magnetic properties of nanocrystalline Zr$$_{6}$$Fe$$_{23}$$ thin films grown on Si(001) substrate

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Random magnetic anisotropy studies in nanocrystalline Pr2Co7Hx (0 ≤ x ≤ 3.75) hydrides

Cited by 17 publications

References 17 publications

Exploration of the Magnetic Properties of ZrCo:Co Bilayer Films: Effects of the Thickness of the Co Layer on the Anisotropy and Magnetic Interaction Parameters

Exploration of the Magnetic Properties of ZrCo:Co Bilayer Films: Effects of the Thickness of the Co Layer on the Anisotropy and Magnetic Interaction Parameters

Influence of Chemical Substitution and Light Element Insertion on the Magnetic Properties of Nanocrystalline Pr2Co7 Compound

Crystal structure, morphology and magnetic properties of nanocrystalline Zr$$_{6}$$Fe$$_{23}$$ thin films grown on Si(001) substrate

Contact Info

Product

Resources

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Random magnetic anisotropy studies in nanocrystalline Pr2Co7Hx (0 ≤ x ≤ 3.75) hydrides