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            Fept for Magnetic Recording Media Application

Piramanayagam, S. N.; Chong, Tow Chong

doi:10.1002/9781118096833.ch11

Cited by 4 publications

(8 citation statements)

References 112 publications

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“…Despite their higher stability, L1 0 MPt compounds cannot be experimentally prepared at r.t. Thermal treatments are always necessary to transform the chemically disordered A1 phase into the chemically ordered L1 0 one [ 95 , 109 , 110 ]. This transformation is a first-order transformation (Ehrenfest designation) [ 99 ] and depends on various factors such as the particle shape and size, 3d metal content (i.e., M:Pt ratio), the temperature and time of the thermal treatment [ 104 , 111 , 112 , 113 ].…”

Section: Magnetism In Transition Metals: the 3d -E...mentioning

confidence: 99%

“…L1 0 MPt alloys, with a composition equal or close to M 50 Pt 50 and an S parameter close to 1, possess complex magnetic properties. Their most relevant magnetic features are a large magnetocrystalline anisotropy (MCA) constant (K), a high coercivity (H c ), a ferromagnetic ground state and T C above RT [ 95 , 110 ]. Nevertheless, what makes them appealing for magnetic devices is their ability to retain their magnetic properties in small-sized nanoparticles.…”

Section: Magnetism In Transition Metals: the 3d -E...mentioning

confidence: 99%

“…At the root of their peculiar magnetic properties, there is a strong interplay between the spin magnetic moment, the orbital magnetic moment and the total magnetic moment (spin + orbital moment) of M and Pt with the crystal lattice through the orbital component [ 15 , 110 , 134 ]. Magnetocrystalline anisotropy mainly arises at the microscopic scale from spin–orbit interactions [ 15 , 134 ].…”

Section: Magnetism In Transition Metals: the 3d -E...mentioning

confidence: 99%

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Review on Magnetism in Catalysis: From Theory to PEMFC Applications of 3d Metal Pt-Based Alloys

Biz

Gracia²,

Fianchini³

2022

IJMS

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The relationship between magnetism and catalysis has been an important topic since the mid-20th century. At present time, the scientific community is well aware that a full comprehension of this relationship is required to face modern challenges, such as the need for clean energy technology. The successful use of (para-)magnetic materials has already been corroborated in catalytic processes, such as hydrogenation, Fenton reaction and ammonia synthesis. These catalysts typically contain transition metals from the first to the third row and are affected by the presence of an external magnetic field. Nowadays, it appears that the most promising approach to reach the goal of a more sustainable future is via ferromagnetic conducting catalysts containing open-shell metals (i.e., Fe, Co and Ni) with extra stabilization coming from the presence of an external magnetic field. However, understanding how intrinsic and extrinsic magnetic features are related to catalysis is still a complex task, especially when catalytic performances are improved by these magnetic phenomena. In the present review, we introduce the relationship between magnetism and catalysis and outline its importance in the production of clean energy, by describing the representative case of 3d metal Pt-based alloys, which are extensively investigated and exploited in PEM fuel cells.

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Section: Magnetism In Transition Metals: the 3d -E...mentioning

confidence: 99%

Section: Magnetism In Transition Metals: the 3d -E...mentioning

confidence: 99%

Section: Magnetism In Transition Metals: the 3d -E...mentioning

confidence: 99%

See 1 more Smart Citation

Review on Magnetism in Catalysis: From Theory to PEMFC Applications of 3d Metal Pt-Based Alloys

Biz

Gracia²,

Fianchini³

2022

IJMS

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“…Besides, a deeper understanding of the MCA of FePt is important regarding current search for suitable rare-earth-free magnetic materials. Transition metals are natural candidates in this respect and attracted a lot of attention recently [16,17].…”

Section: Introductionmentioning

confidence: 99%

Magnetocrystalline anisotropy of FePt: A detailed view

Khan¹,

Blaha²,

Ebert³

et al. 2016

Phys. Rev. B

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To get a reliable ab-initio value for the magneto-crystalline anisotropy (MCA) energy of FePt, we employ the full-potential linearized augmented plane wave (FLAPW) method and the full-potential Korringa-Kohn-Rostoker (KKR) Green function method. The MCA energies calculated by both methods are in a good agreement with each other. As the calculated MCA energy significantly differs from experiment, it is clear that many-body effects beyond the local density approximation are essential. It is not really important whether relativistic effects for FePt are accounted for by solving the full Dirac equation or whether the spin-orbit coupling (SOC) is treated as a correction to the scalar-relativistic Hamiltonian. From the analysis of the dependence of the MCA energy on the magnetization angle and on the SOC strength it follows that the main mechanism of MCA in FePt can be described within second order perturbation theory. However, a distinct contribution not accountable for by second order perturbation theory is present as well.

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“…FePt crystallizes in a tetragonal L1 0 structure (space group P4/mmm) with a = 2.71 Å and c = 3.72 Å26 . It has a Curie temperature safely above room temperature, close to 700 K. This material is notable for its large magnetocrystalline anisotropy energy 27 , which makes it important for applications, such as in magnetic recording [28][29][30] . The spin density has been calculated by density functional theory using WIEN2k code 31 in the generalized gradient approximation of exchangecorrelation effects, see Ref.…”

Section: Simulation Detailsmentioning

confidence: 99%

Quantum-mechanical treatment of atomic resolution differential phase contrast imaging of magnetic materials

Edström,

Lubk,

Rusz

2019

Preprint

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Utilizing the Pauli equation based multislice method, introduced in Phys. Rev. Lett. 116, 127203 (2016), we study the atomic resolution differential phase contrast (DPC) imaging on an example of a hard magnet FePt with in-plane magnetization. Simulated center of mass pattern in a scanning transmission electron microscopy (STEM) experiment carries information about both electric and magnetic fields. The momentum transfer remains curl-free, which has consequences for interpretation of the integrated DPC technique. The extracted magnetic component of the pattern is compared to the expected projected microscopic magnetic field as obtained by density functional theory calculation. Qualitative agreement is obtained for low sample thicknesses and a suitable range of collection angles.

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L 1 ₀ Fept for Magnetic Recording Media Application

Cited by 4 publications

References 112 publications

Review on Magnetism in Catalysis: From Theory to PEMFC Applications of 3d Metal Pt-Based Alloys

Review on Magnetism in Catalysis: From Theory to PEMFC Applications of 3d Metal Pt-Based Alloys

Magnetocrystalline anisotropy of FePt: A detailed view

Quantum-mechanical treatment of atomic resolution differential phase contrast imaging of magnetic materials

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L 1 0 Fept for Magnetic Recording Media Application

Cited by 4 publications

References 112 publications

Review on Magnetism in Catalysis: From Theory to PEMFC Applications of 3d Metal Pt-Based Alloys

Review on Magnetism in Catalysis: From Theory to PEMFC Applications of 3d Metal Pt-Based Alloys

Magnetocrystalline anisotropy of FePt: A detailed view

Quantum-mechanical treatment of atomic resolution differential phase contrast imaging of magnetic materials

Contact Info

Product

Resources

About

L 1 ₀ Fept for Magnetic Recording Media Application