Schuh, Dieter and Biberger, Josef and Bauer, A and Breuer, W and Weiss, Dieter (2001) Hall-Magnetometry on ferromagnetic dots and dot arrays. IEEE Transactions on Magnetics 37, p. 2091.
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The switching of electroplated Nickel- pillars with diameters smaller 170 nm and heights greater 300 nm was investigated. The nanomagnets were placed on top of the sensor either individually or in groups of 5 up to 13 in different patterns. The individual pillars show two types of hysteresis loops: one type resembles a perfect rectangular hysteresis trace over a wide temperature range, the other type shows two steps in the Hall-voltage when magnetization direction is reversed. The switching field Hsw of a pillar with rectangular hysteresis trace was measured between 1.6 K and 225 K. Hsw decreases linearly with increasing temperature. Both results as well as the variation of switching fields of different single domain particles suggest, that oxide layers on the surface of the pillars strongly influence the magnetization reversal. Despite this complication small arrays of Ni pillars placed on the sensor display a well defined switching behavior. Different steps in the Hall-voltage reflect the switching of the individual magnets
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||25 May 2009 13:21|
|Last Modified:||05 Aug 2009 13:57|