Operational amplifier circuits for magnetic sensing using perpendicular low-coercivity nanoscale spin transfer torque magnetic tunnel junctions
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Autor:in (Körperschaft)
Publikationsdatum
15.03.2025
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
IEEE Sensors Journal
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
25
Ausgabe / Nummer
6
Seiten / Dauer
9550-9559
Patentnummer
Verlag / Herausgebende Institution
IEEE
Verlagsort / Veranstaltungsort
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
This article presents the use of nanoscale perpendicular spin transfer torque magnetic tunnel junctions (STT-MTJs) as magnetic sensing units in which the conditioning electronics consists of simple circuits based on operational amplifier (OpAmp). This approach allows low-power ( μ W), nanoscale (50–100 nm), and high-frequency (100–1000 kHz) magnetic measurements, with, in addition, presenting CMOS compatibility for future mass production. Noise levels as low as 2 μ T/ √ Hz are achieved over a dynamic range of up to tens of milliteslas. The different circuits are demonstrated through theoretical modeling and confirmed with experimental measurements on fabricated devices, validating the working principle with sensing elements among the smallest ever reported to our knowledge. Further improvements are, however, required, in both the proposed electronics and stacks of the junctions, to lower the noise and reach the sub-microtesla noise level. Hence, this technology could open the way to new metrological possibilities, unaddressed with existing technologies, including photolithographic mask alignment or high-frequency current measurements, in the case of industrial applications, as well as measurements of magnetic beads and ferromagnetic particle detection in life sciences.
Schlagwörter
Sensors, Magnetic tunneling, Magnetic sensors, Magnetic field measurement, Circuits, Voltage measurement, Junctions, Probes, Noise, Nanoscale devices
Fachgebiet (DDC)
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
1530-437X
1558-1748
1558-1748
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Closed
Lizenz
Zitation
Nicolas, H., Sousa, R. C., Mora-Hernández, A., Prejbeanu, I.-L., Hebrard, L., Kammerer, J.-B., & Pascal, J. (2025). Operational amplifier circuits for magnetic sensing using perpendicular low-coercivity nanoscale spin transfer torque magnetic tunnel junctions. IEEE Sensors Journal, 25(6), 9550–9559. https://doi.org/10.1109/jsen.2025.3537700