Micromagnetic simulations of the domain structure and the magnetization reversal of Co50Ni50/Pt multilayer dots

Sindhu, S.; Haast, M.A.M.; Ramstöck, K.; Abelmann, Léon; Lodder, J.C.

doi:10.1016/s0304-8853(01)00919-2

Cited by 12 publications

(8 citation statements)

References 30 publications

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“…1 In conventional lithography a pattern is typically created in a resist layer which is subsequently transferred to a magnetic film. The pattern generation can be accomplished with a number of technologies such as electron beam lithography, 2,3 ion beam lithography, [4][5][6][7][8] near field lithography, 9,10 laser interference lithography, [11][12][13][14] x-ray lithography, 15,16 or nanoimprint. 17,18 Unfortunately, most methods may not be suitable for largescale device fabrication because they are multistep, expensive, and involve time-consuming procedures.…”

mentioning

confidence: 99%

Arrays of magnetic nanoindentations with perpendicular anisotropy

Makarov¹,

Baraban²,

Guhr³

et al. 2007

Applied Physics Letters

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The authors report an approach to the fabrication of periodic magnetic patterns using spherical indentations. These troughs are shaped by an imprint technique, employing a self-assembled monolayer of particles. Well-defined structures with perpendicular magnetic anisotropy are obtained by deposition of Co/ Pd multilayer films onto the topographic array. The structures formed in the indentations can be magnetically exchange decoupled from their neighbors depending critically on their specific shape. The presented concept leads to a realization of a magnetic nanostructure medium, which offers advances in achieving high pattern densities combining a low cost nanoimprint approach with material functionalization.

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mentioning

confidence: 99%

Arrays of magnetic nanoindentations with perpendicular anisotropy

Makarov¹,

Baraban²,

Guhr³

et al. 2007

Applied Physics Letters

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“…It is very likely that both states are stable in a wide range of diameters, even at room temperature. Next to the total energy, the magnetization as a function of external field was simulated for different dot shapes (cylindrical, pointed cone and truncated cone) [95]. These simulations clearly show that the shape of the dots strongly influences the switching field, with values ranging from to 0.5 down to 0.22 H k .…”

Section: Micromagnetic Calculations Of Magnetization Reversalmentioning

confidence: 97%

“…Due the constraints imposed by the FFT method used for stray field computation, a uniform grid and rectangular computational areas are needed. The simulations are described in [95]. From the experimental data we know that the dots were not perfect cylinders due to etching damage but appear as truncated cones.…”

Section: Micromagnetic Calculations Of Magnetization Reversalmentioning

confidence: 99%

Patterned Magnetic Thin Films for Ultra High Density Recording

Lodder

Haast

Abelmann

2001

Magnetic Storage Systems Beyond 2000

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The areal bit density of magnetic disk recording has increased since 1990 60% per year and even in the last years 100%. Extrapolation of these rates leads to recording parameters not likely to be achieved without changes in the present way of storing hard disk data. One of the possible solutions is the development of so-called patterned magnetic media. Such media will also shift the superparamagnetic limit positively in comparison with the present thin film media. Theoretically, a bit density in the order of Tbits/in 2 may be possible by using this so-called discrete magnetic recording scheme. The patterned structures presented in this paper consist of a regular two-dimensional array of single domain dots with large uniaxial magnetic anisotropy and have been prepared from CoNi/Pt multilayers with strong intergranular exchange coupling and large perpendicular magnetic anisotropy. For the preparation of the patterned media, a patterning process based on Laser Interference Lithography method (LIL) and Ion Beam Etching has been developed. This technology provides the possibility to pattern 2-D arrays of submicron dots smaller than the critical size for the transition from multi to single domain. The smallest prepared dot sizes are 60 nm with a center-to-center dot spacing of 200 nm and thickness of 30 nm. The magnetic characterization of these dots showed that they are single domain with reasonable coercivity and good thermal stability. Micromagnetic simulations show that the single domain state is the lowest energy state for dots with a diameter below 75nm, which confirms the experimental observations.

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“…Such a study can contribute to understand the behavior of patterned media for high-density recording and also, but also for non-volatile magnetic memories [67]. Later we use the micromagnetic simulation to study the critical size at which the energy of single domain state (SD) equals that of the two-domain state (TD or MD=multi-domain state) [68]. We also started to simulate the switching field distribution of such SD dots.…”

Section: Magnetic Properties Of Patterned Thin Filmsmentioning

confidence: 99%

“…Beside etch damage also imperfect layer growth might influence the switching field. Systematic influences of this kind of factors are discussed in [68]. An example is the slanting of the sidewalls of the dots, resulting from the imperfect resist pattern shape.…”

Section: Magnetic Properties Of Patterned Thin Filmsmentioning

confidence: 99%

Patterned Nanomagnetic Films

Lodder

Advanced Magnetic Nanostructures

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Nano-fabrication technologies for patterned structures made from thin films are reviewed. A classification is made to divide the patterning technologies in two groups namely with and without the using a mask. The more traditional methods as well as a few new methods are discussed al in relation with the application. As mask less methods we discussed direct patterning with ions including FIB, nanopaterning with electron beams, interferometric laser annealing and ion beam induced chemical vapor deposition. The methods using masks are ion irradiation and projection, interference lithography, the use of pre-etched substrates and templates from diblock copolymers and imprint technologies. Also a few remarks are given concerning the magnetic properties of patterned films. Nanometer scale magnetic entities (nanoelements, nanodots, nanomagnets) form a fast growing new area of solid-state physics including the new fields of applications. Two of them are summarized namely media for ultra high-density recording and magnetic logic devices.

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Micromagnetic simulations of the domain structure and the magnetization reversal of Co50Ni50/Pt multilayer dots

Cited by 12 publications

References 30 publications

Arrays of magnetic nanoindentations with perpendicular anisotropy

Arrays of magnetic nanoindentations with perpendicular anisotropy

Patterned Magnetic Thin Films for Ultra High Density Recording

Patterned Nanomagnetic Films

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