Magnetic stray fields of Co-Cr microstrips measured by Lorentz microscopy

Lintelo, J.G.T. te; Lodder, J.C.; McVitie, S.; Chapman, J. N.

doi:10.1063/1.356166

Cited by 3 publications

References 13 publications

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Lorentz Microscopy of Thin‐film Systems

Zweck

Uhlig

2007

Handbook of Magnetism and Advanced Magnetic Materials

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As there is growing interest in laterally confined, small magnetic particles in the sub‐µm and sub‐100 nm regime, researchers look for techniques which are capable to quantitatively measure magnetic properties in this range. Electron microscopy offers a technique which combines very high lateral resolution down to presently 5 nm and at the same time high sensitivity to the specimen's magnetic induction. However, to understand fully the present and future possibilities of ‘Lorentz’ electron microscopy, a brief introduction to the main techniques, such as Fresnel and Foucault imaging, differential phase contrast and electron holography has to be given. This more technical section is followed by various examples of what can be achieved today–measurement of hysteresis loops of individual particles, observation of magnetic configuration in the deep sub‐µm regime, observation of magnetic stray fields–and what will probably be possible in near future.

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Lorentz Microscopy of Thin‐film Systems

Zweck

Uhlig

2007

Handbook of Magnetism and Advanced Magnetic Materials

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Magnetoresistance oscillations induced by periodically arranged micromagnets (invited)

Weiss

Gerhardts

et al. 1997

Journal of Applied Physics

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Probing magnetic fields can be done, e.g., by employing the well established Hall effect. Alternatively, we make use of the ballistic motion of electrons in high mobility two-dimensional electron systems ͑2DES͒ to probe electrically the stray field of periodically arranged micomagnets. We investigate the magnetoresistance of the 2DES underneath arrays of magnetic strips and magnetic dots having periods between 500 nm and 1 m. The periodic stray field gives rise to pronounced oscillations of the resistivity as a function of a homogeneous ͑weak͒ magnetic field. The magnetization orientation of the dots and strips can be aligned in different directions with respect to the current flow through the device. The observed magnetoresistance depends characteristically on the magnetization direction and can be understood in terms of the stray field pattern probed by the electrons.

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Magnetic structures in Co-Cr films for perpendicular recording

et al. 1994

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Recently it has been shown that the areal density of Co-Cr media for perpendicular recording using a single pole head can be in the order of 5-10 GbitJ inch 2 [1]. In this laboratory demonstration a track pitch of 0.5 Ilm (50 kTPI) and a bit length of 260 nm (lOO kFRPI) was achieved. Using the same recording setup , in this paper a MFM image is shown using 300 kFRPI linear bit density and a track width of 0.4 Ilm. With these densities, microstructural features like columnar size, compositional separation of Co and Cr, magnetic coupling and reversal behaviour become more and more important. This paper presents experimental results obtained from Co-Cr thin films by using MFM, study of artificially etched micro-strips and measuring anomalous Hall effect from submicron structures, as well as results obtained from magnetostatic and micromagnetic simulations.

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Magnetic stray fields of Co-Cr microstrips measured by Lorentz microscopy

Cited by 3 publications

References 13 publications

Lorentz Microscopy of Thin‐film Systems

Lorentz Microscopy of Thin‐film Systems

Magnetoresistance oscillations induced by periodically arranged micromagnets (invited)

Magnetic structures in Co-Cr films for perpendicular recording

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