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• W2121325806 abstract "The key to successful data storage is ensuring that the information is not lost.For thousands of years humankind has stored information, from engravingsin marble to magnetic data storage in current times. To ensure the stability ofthe stored data, an energy barrier is required which separates information fromnon-information. In marble the energy barrier is caused by the attractive forcebetween atoms and in magnetism it is due to the magnetic anisotropy.Current hard disk technology has the capability of storing huge amountsof information. A future replacement to the current hard disk is bit patternedmedia which will make even larger storage capacities possible. In bit patternedmedia a bit consists of a magnetic island, separated by non-magnetic material.When a magnetic field is applied, which is sufficiently large to overcome theenergy barrier, the magnetisation direction will reverse and the bit is written.Because of differences in these energy barriers, there is a variation betweenislands in the strength of the magnetic field required to reverse the magnetisationdirection. This phenomenon is known as the switching field distribution.It is possible that there are multiple energy barriers which prevent the completereversal of the magnetisation. In chapter 2 a situation where multipleenergy barriers exist is investigated by applying a magnetic field under an anglewith the magnetic easy axis.Due to the fact that thermal activation aids in overcoming the energy barrier,the required field for reversal varies from instance to instance for the sameisland. This thermally induced switching field distribution can be used to determinethe difference in energy barrier of magneticallyweak and strong islands.In chapter 3 an alloy aswell as twomultilayer structures are compared using thismethod. In chapter 4 the temperature dependence of the thermally inducedswitching field distribution is investigated.For archival purposes it is not the data capacity but the longevity of the datawhich is most relevant. When we want store information which will outlast thehuman race, the medium will have different requirements than a mediumusedfor everyday information storage. For a hard disk, aminimumrequired storagetime of 10 years is acceptable, but for such an archival storage system, 1 millionto 1 billion years is the relevant timescale. In chapter 5 a storage system hasbeen investigated with high energy barriers which should make data storage forsuch timescales possible." @default.
• W2121325806 created "2016-06-24" @default.
• W2121325806 creator A5008310181 @default.
• W2121325806 date "2013-08-09" @default.
• W2121325806 modified "2023-10-01" @default.
• W2121325806 title "Energy barriers in patterned media" @default.
• W2121325806 doi "https://doi.org/10.3990/1.9789036506403" @default.
• W2121325806 hasPublicationYear "2013" @default.
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