Magnetic anisotropy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>L</mml:mi><mml:msub><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msub></mml:mrow></mml:math>FePt and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi>Pt</mml:mi></mml:mrow></mml:math>

Burkert, Till; Eriksson, Olle; Simak, Sergei I.; Ruban, Andrei V.; Sanyal, Biplab; Nordström, Lars; Wills, J. M.

doi:10.1103/physrevb.71.134411

Cited by 129 publications

(94 citation statements)

References 61 publications

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“…Combining FM 3d metals such as iron or cobalt with nonmagnetic 4d and 5d metals produces materials with strong spin-orbit coupling and high magnetic anisotropy [28,38] . The effect of the Pt concentration in the range from 30 to 52 at % on coercivity was studied in bimetallic FePt NPs [39] (Figure 3 ).…”

Section: Polymetallic Npsmentioning

confidence: 99%

Application of alternative energy forms in catalytic reactor engineering

Houlding

Rebrov

2012

Green Processing and Synthesis

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This review provides a general overview of recent applications of magnetic nanoparticles for controlled radiofrequency (RF) heating in catalytic synthesis, mass transfer enhancement in laminar fl ow and magnetic separation. By directly delivering RF energy to magnetic materials, issues such as long heating periods and energy losses can be minimized. The main mechanisms of RF heating are briefl y reviewed. The effect of nanoparticles size, shape and composition on the effi ciency of RF heating is discussed. RF energy has been shown to be effective in many applications, however, it is still not used in chemicals due to high equipment costs.

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Section: Polymetallic Npsmentioning

confidence: 99%

Application of alternative energy forms in catalytic reactor engineering

Houlding

Rebrov

2012

Green Processing and Synthesis

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“…Previous theoretical studies on FePt based on the local density approximation (LDA) give a large spread of the results -from 1.8 meV to 4.3 meV [9,12,[18][19][20][21][22][23][24]. If one restricts to full potential methods only, one still gets a relatively large difference between various studies: E MCA of FePt was determined as 2.7 meV by FP-LMTO calculation of Ravindran et al [12] and FLAPW calculation of Shick and Mryasov [23], 3.1 meV by plane-waves calculation of Kosugi et al [25], and 3.9 meV by FP-LMTO calculation of Galanakis et al [22].…”

Section: Introductionmentioning

confidence: 99%

“…First, one tries to understand the mechanism behind the MCA in simple intuitive terms, so that one would have guidance in search for materials with a high MCA energy [5][6][7]. Second, one tries to find which computational procedures have to be employed so that one can make quantitative predictions on the MCA energy [8][9][10].…”

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 in the tetragonal L1 0 structure is a ferromagnetic material with lattice parameters a = 2.71 Å and c = 3.72 Å 30 and a Curie temperature in the vicinity of 700 K 30 , which has gained much attention, for example, due to its large magnetocrystalline anisotropy 30,31 . Fig.…”

Section: Feptmentioning

confidence: 99%

Magnetic effects in the paraxial regime of elastic electron scattering

2016

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Based on a recent claim [Phys. Rev. Lett. 116, 127203 (2016)] that electron vortex can be used to image magnetism at the nanoscale in elastic scattering experiments, using transmission electron microscopy, a comprehensive computational study is performed to study magnetic effects in the paraxial regime of elastic electron scattering in magnetic solids. Magnetic interactions from electron vortex beams, spin polarized electron beams and beams with phase aberrations are considered, as they pass through ferromagnetic FePt or antiferromagnetic LaMnAsO. The magnetic signals are obtained by comparing the intensity over a disk in the diffraction plane for beams with opposite angular momentum or aberrations. The strongest magnetic signals are obtained from vortex beams with large orbital angular momentum, where relative magnetic signals above 10 −3 are indicated for 10 orbital angular momentum, meaning that relative signals of one percent could be expected with the even larger orbital angular momenta, which have been produced in experimental setups. All results indicate that beams with low acceleration voltage and small convergence angles yield stronger magnetic signals, which is unfortunately problematic for the possibility of high spatial resolution imaging. Nevertheless, under atomic resolution conditions, relative magnetic signals in the order of 10 −4 are demonstrated, corresponding to an increase with one order of magnitude compared to previous work.

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Magnetic anisotropy ofL10FePt andFe1−xMnxPt

Cited by 129 publications

References 61 publications

Application of alternative energy forms in catalytic reactor engineering

Application of alternative energy forms in catalytic reactor engineering

Magnetocrystalline anisotropy of FePt: A detailed view

Magnetic effects in the paraxial regime of elastic electron scattering

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