The role of short exchange length in the magnetization processes of L10-ordered FePt perpendicular media

Piao, Kun; Li, Dingjun; Wei, Dan

doi:10.1016/j.jmmm.2006.01.089

Cited by 16 publications

(5 citation statements)

References 9 publications

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“…Although such microstructures can be modeled as Voronoi tessellations [53][54][55] or as regular hexagonal arrays [56,57], in this case grains with square [58] cross sections were considered, and modeling was carried out using the NIST OOMMF code [41]. Three-dimensional simulations, including two-dimensional periodic boundary conditions (PBCs) [59] neglecting thermal excitation effects (corresponding to zero temperature) [55,60], were carried out on both 10-and 20-nm-thick CoCrPt layers.…”

Section: Resultsmentioning

confidence: 99%

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

et al. 2014

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Ferromagnetic domain patterns and three-dimensional domain-wall configurations in thin CoCrPt films with perpendicular magnetic anisotropy were studied in detail by combining magnetic force microscopy and polarized neutron reflectometry with micromagnetic simulations. With the first method, lateral dimension of domains with alternative magnetization directions normal to the surface and separated by domain walls in 20-nm-thick CoCrPt films were determined in good agreement with micromagnetic simulations. Quantitative analysis of data on reflectometry shows that domain walls consist of a Bloch wall in the center of the thin film, which is gradually transformed into a pair of Néel caps at the surfaces. The width and in-depth thickness of the Bloch wall element, transition region, and Néel caps are found consistent with micromagnetic calculations. A complex structure of domain walls serves to compromise a competition between exchange interactions, keeping spins parallel, magnetic anisotropy orienting magnetization normal to the surface, and demagnetizing fields, promoting in-plane magnetization. It is shown that the result of such competition strongly depends on the film thickness, and in the thinner CoCrPt film (10 nm thick), simple Bloch walls separate domains. Their lateral dimensions estimated from neutron scattering experiments agree with micromagnetic simulations.

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Section: Resultsmentioning

confidence: 99%

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

et al. 2014

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“…The 3-D fast fourier transform (FFT) could be utilized when calculating the demagnetizing field [9].…”

Section: Article In Pressmentioning

confidence: 99%

Micromagnetic modeling for heat-assisted magnetic recording

Wei

2008

Journal of Magnetism and Magnetic Materials

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“…Ferromagnetic FePt nanoparticles are natural candidates for supporting spin-wave solitons ( 8 ) of the ultimate smallest size. The fundamental size limit is given by the so-called exchange length that in FePt is between 1 and 5 nm ( 17 ) and is thus substantially smaller than typical magnetic nanoparticle sizes (see Fig. 1 ).…”

Section: Introductionmentioning

confidence: 99%

“…1 with red/blue color depicting up/down magnetization components). The magnetocrystalline anisotropy in FePt is extremely large ( 17 ), leading to small values of the exchange length and, thus, to domain-wall widths on the order of only a few atomic spacings, as schematically shown in the top inset of Fig. 1 .…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium sub–10 nm spin-wave soliton formation in FePt nanoparticles

et al. 2022

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Magnetic nanoparticles such as FePt in the L1 0 phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magnetocrystalline anisotropy. This, in turn, reduces the magnetic exchange length to just a few nanometers, enabling magnetic structures to be induced within the nanoparticles. Here, we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved x-ray diffraction and micromagnetic modeling that spin-wave solitons of sub–10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin precession frequency of 0.1 THz positions this system as a platform to develop novel miniature devices.

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The role of short exchange length in the magnetization processes of L10-ordered FePt perpendicular media

Cited by 16 publications

References 9 publications

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

Micromagnetic modeling for heat-assisted magnetic recording

Nonequilibrium sub–10 nm spin-wave soliton formation in FePt nanoparticles

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