Low-coercivity perpendicular spin transfer torque magnetic tunnel junctions as nanoscale magnetic sensors

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Authors
Sousa, Ricardo C.
Mora-Hernández, Ariam
Prejbeanu, Ioan-Lucian
Hebrard, Luc
Kammerer, Jean-Baptiste
Author (Corporation)
Publication date
09/2023
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Type
04B - Conference paper
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Parent work
2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)
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Publisher / Publishing institution
IEEE
Place of publication / Event location
Canada
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Abstract
This paper presents the use of the spin transfer torque effect in perpendicular magnetic tunnel junctions to operate the devices as magnetic sensors. The junctions, specifically designed for sensing applications exhibit close to low-coercivity, allowing the sensitivity to be as high as 25 mV/mT for a large dynamic range of 20 mT. In addition, the junctions have diameters ranging from 20 to 100 nanometers, making them among the smallest magnetic sensing elements ever reported to our knowledge. A single operational amplifier operates the junction and outputs a voltage proportional to the external magnetic field. This paper opens the way to a monolithic integration of both the conditioning electronics and the perpendicular magnetic tunnel junction.
Keywords
Torque, Sensitivity, Magnetic sensors, Monolithic integrated circuits, Voltage, Nanoscale devices, Distance measurement
Subject (DDC)
600 - Technik, Medizin, angewandte Wissenschaften
Project
Event
2023 IEEE International Magnetic Conference
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Conference start date
15.05.2023
Conference end date
19.05.2023
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ISBN
979-8-3503-3836-2
979-8-3503-3837-9
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Language
English
Created during FHNW affiliation
Yes
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Publication status
Published
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Peer review of the complete publication
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Closed
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Citation
NICOLAS, Hugo, Ricardo C. SOUSA, Ariam MORA-HERNÁNDEZ, Ioan-Lucian PREJBEANU, Luc HEBRARD, Jean-Baptiste KAMMERER und Joris PASCAL, 2023. Low-coercivity perpendicular spin transfer torque magnetic tunnel junctions as nanoscale magnetic sensors. In: 2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers). Canada: IEEE. September 2023. ISBN 979-8-3503-3836-2. Verfügbar unter: https://irf.fhnw.ch/handle/11654/45333