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PGI Kolloquium:

Prof. Dr. Manfred Albrecht,Institute of Physics, University of Augsburg, Germany

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

Anfang
26.06.2015 11:00 Uhr

Future concepts and materials for magnetic data storage

AlbrechtCopyright: Prof. Dr. Albrecht

Due to the increasing demand in high-density recording media, magnetic thin films with high magnetic anisotropy are widely studied in order to overcome the superparamagnetic effect. To fulfill the requirements of thermal stability, hard magnetic alloys, i.e. FePt alloys in the L10 phase are promising candidates as storage layer.

However, owing to the large magnetic anisotropy, the magnetic field required to reverse the magnetization of the media may become higher than the field provided by a conventional recording head. To solve this, so-called writeability issue, the concepts of exchange-coupled composite (ECC) media, thermal assisted recording as well as bit patterned media were suggested. Alternatively, the concept of percolated perpendicular media will be discussed as well, in which densely distri¬buted pinning sites lead to smooth transition boundaries, which might be realized by the deposition of a magnetic film onto nanopore arrays.

Furthermore, ultrafast magnetization switching is at the heart of both modern information storage technology and fundamental science. In this regard, it was recently observed that ultra-fast magnetization reversal processes can be induced by circularly polarized laser pulses in amorphous ferrimagnetic GdFeCo alloy thin films. This novel observation resulted in a broad range of exciting and challenging fundamental questions, and may enable new applications based on ultra-fast spintronics. An overview of our activities on all-optical switching in amorphous ferrimagnetic Tb-Fe alloy films will be presented.

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