Journal article
Spin in organics: a new route to spintronics
Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences, Vol.369(1951), pp.3602-3616
09/28/2011
DOI: 10.1098/rsta.2011.0172
PMID: 21859724
Abstract
New developments in the nascent field of organic spintronics are discussed. Two classes of phenomena can be discerned. In hybrid organic spin valves (OSVs), an organic semiconducting film is sandwiched between two ferromagnetic (FM) thin films, aiming at magnetoresistive effects as a function of the relative alignment of the respective magnetization directions. Alternatively, organic magnetoresistance (OMAR) is achieved without any FM components, and is an intrinsic property of the organic semiconductor material. Some of the exciting characteristics of OMAR, in both electrical conductance and photoconductance, are presented. A systematic, combined experimentaltheoretical study of sign changes between positive and negative magnetoresistance is shown to provide important insight about the underlying mechanisms of OMAR. A simple explanation of experimental observations is obtained by combining a spin-blocking mechanism, an essential ingredient in the recently proposed bipolaron model, with specific features of the device physics of space charge limited current devices in the bipolar regime. Finally, we discuss possible links between the physics relevant for OMAR and that for OSVs. More specifically, weak hyperfine fields from the hydrogen atoms in organic materials are thought to be crucial for a proper understanding of both types of phenomena.
New developments in the nascent field of organic spintronics are discussed. Two classes of phenomena can be discerned. In hybrid organic spin valves (OSVs), an organic semiconducting film is sandwiched between two ferromagnetic (FM) thin films, aiming at magnetoresistive effects as a function of the relative alignment of the respective magnetization directions. Alternatively, organic magnetoresistance (OMAR) is achieved without any FM components, and is an intrinsic property of the organic semiconductor material. Some of the exciting characteristics of OMAR, in both electrical conductance and photoconductance, are presented. A systematic, combined experimentaltheoretical study of sign changes between positive and negative magnetoresistance is shown to provide important insight about the underlying mechanisms of OMAR. A simple explanation of experimental observations is obtained by combining a spin-blocking mechanism, an essential ingredient in the recently proposed bipolaron model, with specific features of the device physics of space charge limited current devices in the bipolar regime. Finally, we discuss possible links between the physics relevant for OMAR and that for OSVs. More specifically, weak hyperfine fields from the hydrogen atoms in organic materials are thought to be crucial for a proper understanding of both types of phenomena.
Details
- Title: Subtitle
- Spin in organics: a new route to spintronics
- Creators
- Bert Koopmans - Eindhoven University of TechnologyWiebe Wagemans - Eindhoven University of TechnologyFrancisco L Bloom - Eindhoven University of TechnologyPeter A Bobbert - Eindhoven University of TechnologyMartijn Kemerink - Eindhoven University of TechnologyMarkus Wohlgenannt - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences, Vol.369(1951), pp.3602-3616
- Publisher
- The Royal Society
- DOI
- 10.1098/rsta.2011.0172
- PMID
- 21859724
- ISSN
- 1364-503X
- eISSN
- 1471-2962
- Alternative title
- Review. An organic route to spintronics
- Language
- English
- Date published
- 09/28/2011
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199927702771
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