Planar Hall ring sensor for ultra-low magnetic moment sensing

Tran Quang Hung, Ferial Terki, Souleymanne Kamara, Kunwoo Kim, Salam Charar, CheolGi Kim

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The field sensitivity of a planar Hall effect (PHE) micro-ring type biosensor has been investigated as a function of magnetizing angle of the sensor material, for the sensing of low magnetic moment superparamagnetic labels. The field sensitivity is maximal at a magnetizing angle of α = 20°. At this optimized magnetizing angle, the field sensitivity of a PHE sensor is about 3.6 times higher than that measured at the conventional configuration, α = 90°. This optimization enables the PHE-ring sensor to detect superparamagnetic biolabels with ultra-low magnetic moments down to 4 × 10-13 emu.
Original languageEnglish
JournalJournal of Applied Physics
Volume117
Issue number15
Pages (from-to)154505
Number of pages1
ISSN0021-8979
DOIs
Publication statusPublished - 2015

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