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Publisher DOI: 10.1002/aelm.202200082
Title: Spin‐ and Stress‐Depending Electrical Transport in Nanoparticle Supercrystals: Sensing Elastic Properties of Organic Tunnel Barriers via Tunneling Magnetoresistance
Language: English
Authors: Dreyer, Axel 
Rempel, Thomas 
Gottschalk, Martin 
Zierold, Robert 
Weimer, Agnes 
Feld, Artur 
Schneider, Gerold A. 
Weller, Horst 
Hütten, Andreas 
Keywords: force sensor; nanoparticle; organic barrier; supercrystal; tunneling conductance
Issue Date: 26-May-2022
Publisher: Wiley-VCH Verlag
Source: Advanced Electronic Materials 8 (9): 2200082 (2022-05-26)
Abstract (english): 
The spin‐dependent electrical transport in rigid inorganic‐inorganic layered systems is extensively applied for the detection of magnetic fields in data storage. In this work, spin‐dependent electrical transport in flexible organic‐inorganic supercrystals based on superparamagnetic iron oxide nanoparticles is investigated. These nanoparticles are stabilized by oleic acid ligands, which in turn are serving as tunneling barriers between individual magnetic nanoparticles. The resulting tunneling magnetoresistance (TMR) is tunable due to the elastic properties of these organic barriers. Applying external mechanical stress on this composite material will change the average distance between adjacent nanoparticles and will hence determine the resulting TMR‐effect amplitude. Thus, measured stress‐induced changes in the barrier thickness at sub‐nanometer scale allow for determining the mechanical properties of organic barrier molecules in the confined space between the particles. These results provide the foundation for a new type of mechanical sensor.
DOI: 10.15480/882.4600
ISSN: 2199-160X
Journal: Advanced electronic materials 
Institute: Keramische Hochleistungswerkstoffe M-9 
Document Type: Article
Project: SFB 986: Teilprojekt C05 - Oxidische Hochtemperatur-Schutzschichtsysteme mittels angepasster Porenstruktur 
SFB 986: Teilprojekt A06 - Herstellung und Charakterisierung hierarchischer, multi-funktionaler Keramik/Metall-Polymer Materialsysteme 
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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