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5 Acta Physica Polonica A

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Correlations of Mechanical Stresses and Magnetical Behaviour of Ion Implanted Magneto-Optical Layers

100%

Hubenthal F. , Röll K.

nr 3

427-430

Magneto-optical materials such as TbFeCo are used for data storage in a wide range. Especially the perpendicular magnetic anisotropy is necessary for high density recording. But the origin of the perpendicular magnetic anisotropy in these magneto-optical layers is not exactly known. In our experiments magneto-optical layers were implanted with heavy ions, with the aim to change the magnetic behaviour of these layers. After the implantation there is a dramatical change in the magnetical and mechanical behaviour, too.

Structure and Magnetic Properties of Ni/Ti Multilayers

80%

Szymański B. , Stobiecki F. , Otto T. , Röll K.

Acta Physica Polonica A

1997

tom 91

nr 1

233-236

We report a study of structure and magnetic properties of Ni/Ti multilayers with different modulation wavelength, 10 nm ≤ λ ≤ 40 nm, and constant sublayers thickness ratio d_{Ni}/d_{Ti}=1. Specimens were characterized with X-ray diffraction, vibrating sample magnetometer and torque meter in as-deposited state and in successive stages of isothermal annealing at 423 K. Hysteresis curves of as-deposited samples revealed the typical feature of ferromagnetic films with predominant shape anisotropy. During annealing very pronounced changes in the hysteresis loops were observed. An analysis of the loops indicates the occurrence of distinct changes in magnetic anisotropy of Ni sublayers: their effective shape anisotropy is drastically reduced due to a development of the perpendicular anisotropy and/or a modification of the microstructure. The effect can possibly be applied to achieve desirable variation of perpendicular anisotropy in multilayers which consist of Ni sublayers.

Creation and Observation of Domain Structures with a Special Kerr Microscope

80%

Knappmann S. , Röll K. , Stobiecki F.

nr 3

475-478

A Kerr microscope is presented, which on the one hand allows us to make, in a conventional manner, images of domains in thin films with perpendicular magnetic anisotropy. On the other hand, it is possible to heat the sample locally by a focussed laser beam and make images simultaneously. Therefore, it is possible to write domains thermomagnetically and further to observe temperature dependent magnetic reorientations. For demonstration domains have been created thermomagnetically in TbFe multilayers. Writing with low magnetic field leads to domains with a subdomain structure, as it has been found previously by Lorentz microscopy.

High-Quality Ni-Fe/Cu Multilayer Films with Antiferromagnetic Coupling

61%

Stobiecki F. , Dubowik J. , Luciński T. , Szymański B. , Rohrmann H. , Röll K. , Schmidt M.

Acta Physica Polonica A

1997

tom 91

nr 2

277-280

We report structural and magnetic properties of Ni_{83}Fe_{17}/Cu multilayer films with various buffer layer and sublayer thicknesses of copper d_{Cu} and Permalloy d_{Py} deposited by face-to-face sputtering. The following features prove a good quality of our films: a well-layered structure, complete antiferromagnetic coupling with a low coupling strength (2×10^{-5} J/m^{2} for d_{Cu}=1 nm and 10^{-6} J/m^{^2} for d_{Cu}=2.1 nm) and a low coercive field which make them attractive for possible applications as giant magnetoresistance sensors.

Temperature Dependence of Magnetisation Reversal and GMR in Spin Valve Structures

51%

Stobiecki F. , Stobiecki T. , Ocker B. , Maass W. , Powroznik W. , Paja A. , Loch C. , Röll K.

nr 3

523-526

Temperature measurements of magnetisation reversal, resistance and magnetoresistance of Co/Cu/Co/FeMn spin valve structures deposited in different conditions were performed. The influence of exchange anisotropy energy, interlayer coupling energy, and electron transport properties were taken into consideration in explaining differences in giant magnetoresistance effect of investigated samples.