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http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-71358

Kurzfassung in Englisch

In the thesis at hand, different concepts of magnetic recording were investigated both from an experimental and theoretical point of view. On the one hand, micromagnetic simulations of bit patterned media were performed examining the influence of magnetic and geometrical parameters on the magnetization reversal mechanism of the bit array. In this regard, the recording concept called exchange coupled composite (ECC) media was applied in combination with bit patterned media (BPM). It was demonstrated that ECC/BPM is superior in terms of narrowing the SFD which is vital for the implementation of BPM as a recording scheme in magnetic data storage deviced. Moreover, the stability of the magnetic state was calculated for single nanomagnets using the nudged elastic band algorithm. It was found out that the magnetic and geometrical properties have a severe influence on both, the energy barrier for magnetization reversal and the magnetization reversal process of the single nanomagnets. On the other hand, experimental studies of granular CoCrPt:SiO2 films deposited on self-assembled arrays of SiO2 nanoparticles with a size from 10 nm to 330 nm have been carried out, showing a distinct size-dependence of the coercive field and remanent magnetization with changing nanoparticle size. Moreover, these films have been irradiated with Co+ ions with different fluences, resulting in a change of the magnetic properties of the films due to both a change of the intergranular exchange coupling of the film and a degredation of the magnetic layers at higher irradiation fluences.

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