5 years ago

Tuning of a Vertical Spin Valve with a Monolayer of Single Molecule Magnets

Tuning of a Vertical Spin Valve with a Monolayer of Single Molecule Magnets
Martina Torelli, Roberta Sessoli, Philippe Sainctavit, Irene Cimatti, Edwige Otero, Federico Bertani, Lorenzo Poggini, Brunetto Cortigiani, Enrico Dalcanale, Matteo Mannini, Philippe Ohresser, Nicola Cristiani, Alessandro Pedrini, Alek Dediu, Giuseppe Cucinotta, Patrizio Graziosi
The synthesis and the chemisorption from solution of a terbium bis-phthalocyaninato complex suitable for the functionalization of lanthanum strontium manganite (LSMO) are reported. Two phosphonate groups are introduced in the double decker structure in order to allow the grafting to the ferromagnetic substrate actively used as injection electrode in organic spin valve devices. The covalent bonding of functionalized terbium bis-phthalocyaninato system on LSMO surface preserves its molecular properties at the nanoscale. X-ray photoelectron spectroscopy confirms the integrity of the molecules on the LSMO surface and a small magnetic hysteresis reminiscent of the typical single molecule magnet behavior of this system is detected on surface by X-ray magnetic circular dichroism experiments. The effect of the hybrid magnetic electrode on spin polarized injection is investigated in vertical organic spin valve devices and compared to the behavior of similar spin valves embedding a single diamagnetic layer of alkyl phosphonate molecules analogously chemisorbed on LSMO. Magnetoresistance experiments have evidenced significant alterations of the magneto-transport by the terbium bis-phthalocyaninato complex characterized by two distinct temperature regimes, below and above 50 K, respectively. Spinterface tuning of a vertical spin-valve is achieved by the chemical functionalization of the spin-injecting electrode with a terbium(III) bis(phthalocyaninato) monolayer grafted from solution. Comparing the results obtained with a similar device fabricated including a diamagnetic layer it is possible to evidence that the single molecule magnets film constitutes an additional spin-scattering layer able to control directly the magnetoresistance strength.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201703600

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.