| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lee, Stephen Leslie
University of St Andrews
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2023Spin-orbit driven superconducting proximity effects in Pt/Nb thin filmscitations
- 2021Structural features in some layered hybrid copper chloride perovskitescitations
- 2018Observation of anomalous Meissner screening in Cu/Nb and Cu/Nb/Co thin filmscitations
- 2017Emergent magnetism at transition-metal–nanocarbon interfacescitations
- 2016Beating the Stoner criterion using molecular interfacescitations
- 2016Dynamical torque in CoxFe3–xO4 nanocube thin films characterized by femtosecond magneto-optics : a π-shift control of the magnetization precessioncitations
- 2016Remotely induced magnetism in a normal metal using a superconducting spin-valvecitations
- 2016Dynamical torque in Co x Fe 3–x O 4 nanocube thin films characterized by femtosecond magneto-optics:a π-shift control of the magnetization precessioncitations
- 2016Dynamical torque in CoxFe3–xO4 nanocube thin films characterized by femtosecond magneto-opticscitations
- 2015Beating the Stoner criterion using molecular interfacescitations
- 2005Agglomeration and sintering in annealed FePt nanoparticle assemblies studied by small angle neutron scattering and x-ray diffractioncitations
- 2005Coexistence and coupling of superconductivity and magnetism in thin film structurescitations
- 2004Structural and magnetic model of self-assembled FePt nanoparticle arrayscitations
- 2003μSR Studies of the Interaction between Magnetism and Superconductivity in κ-BETS 2 FeCl 4citations
Places of action
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article
Beating the Stoner criterion using molecular interfaces
Abstract
Only three elements are ferromagnetic at room temperature: the transition metals iron, cobalt and nickel. The Stoner criterion explains why iron is ferromagnetic but manganese, for example, is not, even though both elements have an unfilled <i>3d</i> shell and are adjacent in the periodic table: according to this criterion, the product of the density of states and the exchange integral must be greater than unity for spontaneous spin ordering to emerge. Here we demonstrate that it is possible to alter the electronic states of non-ferromagnetic materials, such as diamagnetic copper and paramagnetic manganese, to overcome the Stoner criterion and make them ferromagnetic at room temperature. This effect is achieved via interfaces between metallic thin films and C<sub>60</sub> molecular layers. The emergent ferromagnetic state exists over several layers of the metal before being quenched at large sample thicknesses by the materiala € s bulk properties. Although the induced magnetization is easily measurable by magnetometry, low-energy muon spin spectroscopy provides insight into its distribution by studying the depolarization process of low-energy muons implanted in the sample. This technique indicates localized spin-ordered states at, and close to, the metal-molecule interface. Density functional theory simulations suggest a mechanism based on magnetic hardening of the metal atoms, owing to electron transfer. This mechanism might allow for the exploitation of molecular coupling to design magnetic metamaterials using abundant, non-toxic components such as organic semiconductors. Charge transfer at molecular interfaces may thus be used to control spin polarization or magnetization, with consequences for the design of devices for electronic, power or computing applications (see, for example, refs 6 and 7).