Ferromagnetic materials for the controlled positioning of domain walls


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2013-2016

FUNDING AMOUNT

1098500 PLN

ABSTRACT

The project envisages the creation of a number of structures, with an anisotropy gradient or interactions with ferromagnetic interlayers, to investigate the effect of various parameters (sublayers material, structure, roughness) on their magnetic properties. The use of structures with anisotropy / interaction gradient, obtained by ion bombardment or by using wedge layers, will minimize the negative impact of accidental changes in the application conditions on the magnetic parameters obtained in the measurements. The magnetic layers will be made of Co or its alloys (e.g. Co-Fe, Co-Fe-B). In order to induce PMA in thin magnetic layers, a strong perpendicular surface anisotropy of ferromagnetic layers surrounded with precious metals will be used (eg Au, Pt,). We also plan to create layers in which a wedge layer of another metal will be introduced between the Au or Pt layers and the ferromagnetic layers to obtain a controlled change in anisotropy. Multiple layers will be applied mainly using the sputtering method. Ion bombardment (IB) will be used to modify the structure of the inter-surface and, as a consequence, magnetic anisotropy. In addition to testing multiple layers where the magnetic properties change monotonically along a specific direction, attempts will be made to obtain systems with different characteristics of property changes in the position function, for example centro-symmetry or symmetry mirrored with respect to the centerline in the sample plane. Such systems can be used as functional materials that use the effect of magntrophoresis to accumulate magnetic particles in an area with a small surface area. Part of the research on the impact of IB on PMA will be carried out with the use of multiple layers subjected to structuring using electron lithography available at IFM PAN. This will allow to determine the effect of reducing sample sizes on DW propagation along the anisotropy or interaction gradient. It is foreseen to examine the influence of various types of couplings (interchangeable type RKKY, magnetostatic caused by the roughness of the inter-surface, direct resulting from the discontinuous structure of the spacer) for re-magnetization. We are interested in the possibility of using inter-layer interaction to modify the switching areas of the layered system. Structural research (texture, layer thickness) will be made using high and low angle X-ray diffraction (IFM) and electron microscopy (IFM). Measurements of magnetic hysteresis will be used to determine the magnetic anisotropy of the layers and the coupling between them. Tests of magnetic properties of samples will be made using a magnetometer with a vibrating sample in the IFM and using a magneto-optical magnetometer. The magnetic (domain) structure will be examined using kerrov microscopy and magnetic force microscopy. More... »

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