Structural and magnetic properties of L10/A1, FePt nanocomposites

Giannopoulos, G.; Speliotis, Th.; Li, W.F.; Hadjipanayis, G. C.; Niarchos, D.

doi:10.1016/j.jmmm.2012.08.003

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…The equilibrium state is achieved by minimizing the energy at zero applied field with the initial configuration of completely randomized spins. The value of saturation magnetization (M s ) of FePt and FeCo is considered to be 1.1 × 10 6 A m −1 (or 1100 emu cm −3 [44]) and 1.4 × 10 6 A m −1 [31] (or 1400 emu cm −3 ) respectively. The exchange stiffness constant (A) is considered to be 1.2 × 10 −9 J m −1 [45] and 1.8 × 10 −11 J m −1 [46] for FePt and FeCo respectively.…”

Section: Resultsmentioning

confidence: 99%

Domain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling

Vashisht

Hussain

Sulania

et al. 2021

J. Phys.: Condens. Matter

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We report the complex implications of inter-diffusion between polycrystalline FePt/FeCo layers as an impact of the FeCo underlayer on the structural and magnetic properties of the system. The crystalline growth of FePt strongly reduces in an entirely diffused system compared to the one with lesser diffusion, while the crystalline structure of FeCo is apparently less affected. Charge redistribution occurs between Fe, Co and Pt ensuring increased Co-Pt and Fe-Pt interactions with higher diffusion. Thereafter, we combine hysteresis and magnetic force microscopy measurements to show that the interfacial deformations result in the distinct out-plane magnetic behaviour of the system. FeCo@FePt nano-composite like structure, originating due to interfacial diffusion, shows interactions between two magnetic phases with in-plane low anisotropy exhibiting wasp-shaped out-plane hysteresis loop. Whereas the layered structure of FePt/FeCo films shows random anisotropy with a significant out-plane contribution even in the polycrystalline films. Micromagnetic modelling demonstrates coercivity deterioration and reduction of switching field due to the formation of a slightly diffused interface. Contrarily, the experimental observations for complete diffusion between the two layers are explained by simulating the inhomogeneous distribution of anisotropies along the film plane. These studies provide deep perceptions of the magnetic properties of FePt/FeCo system governed by diffusion kinetics which are valuable to achieve desired magnetic characteristics using this system.

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Section: Resultsmentioning

confidence: 99%

Domain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling

Vashisht

Hussain

Sulania

et al. 2021

J. Phys.: Condens. Matter

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“…The coercivity amounts to 2.8 T for the pure L1 0 ‐FePt nanoparticulated film and is given by 0.4 T for a 10 nm thick Fe film on top of the L1 0 ‐FePt nanoparticulated film . A similar behavior is observed when A1‐FePt is used as soft magnet film instead of Fe .…”

Section: Granular Mediamentioning

confidence: 54%

“…Domain‐wall assisted magnetic recording is based on exchange‐coupled composite (ECC) media in which each dot is composed of a hard and a soft magnetic part coupled through exchange interaction through their common interface. The interface between the two materials can be sharp or graded , the cross‐section of the two magnetic parts can be identical or in the case of ledge‐type ECC elements of soft sections which are more extended in the recording direction . The inhomogeneous anisotropy along the medium grain axis enables nucleation of a domain wall at significantly smaller fields than the switching field of the pure hard magnetic layer.…”

Section: Introductionmentioning

confidence: 99%

Large-area hard magnetic L1₀ -FePt and composite L1₀ -FePt based nanopatterns

Goll

Bublat

2013

Phys. Status Solidi A

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Bit-patterned media with a regular arrangement of extremely hard magnetic nanodots is a very promising concept for next generation ultrahigh density magnetic recording to realize storage densities of 1 Tbits in À2 and far beyond. To enable writeability with conventional writing heads the switching process may be thermally, microwave or domain-wall assisted. This paper concentrates on the fabrication and characterization of large-area hard magnetic L1 0 -FePt and composite L1 0 -FePt based granular and bit-patterned media. Within the framework of micromagnetism the magnetic reversal mechanism of different types of nanodots is analyzed from the temperature dependence and angular dependence of the switching field.

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“…The face-centered-tetragonal (fct) L1 0 -FePt alloy with large magnetocrystalline anisotropy content was regarded as the most promising material for ultra high density perpendicular magnetic recording [1,2]. However, the high coercivity of FePt greatly exceeds the writing field of available heads, which is limited by the head materials [3]. Thus, it is necessary to find a way to reduce the writing field.…”

Section: Introductionmentioning

confidence: 99%

A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films

Xiao

Wang

et al. 2019

Nanomaterials

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An appropriate writing field is very important for magnetic storage application of L10 FePt nanocomposite thin films. However, the applications of pure L10 FePt are limited due to its large coercivity. In this paper, the ratios of L10 and non-L10 phase FePt alloy nanoparticles in FePt/MgO (100) nanocomposite thin films were successfully tuned by pulsed laser deposition method. By adjusting the pulsed laser energy density from 3 to 7 J/cm2, the ordering parameter initially increased, and then decreased. The highest ordering parameter of 0.9 was obtained at the pulsed laser energy density of 5 J/cm2. At this maximum value, the sample had the least amount of the soft magnetic phase of almost 0%, as analyzed by a magnetic susceptibility study. The saturation magnetization decreased with the increase in the content of soft magnetic phase. Therefore, the magnetic properties of FePt nanocomposite thin films can be controlled, which would be beneficial for the magnetic applications of these thin films.

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Structural and magnetic properties of L10/A1, FePt nanocomposites

Cited by 8 publications

References 17 publications

Domain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling

Domain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling

Large-area hard magnetic L1₀ -FePt and composite L1₀ -FePt based nanopatterns

A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films

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Structural and magnetic properties of L10/A1, FePt nanocomposites

Cited by 8 publications

References 17 publications

Domain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling

Domain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling

Large-area hard magnetic L10 -FePt and composite L10 -FePt based nanopatterns

A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films

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Large-area hard magnetic L1₀ -FePt and composite L1₀ -FePt based nanopatterns