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Nanometers-thick Ferromagnetic Surface Produced by Laser Cutting of Diamond
Annette Setzer, Pablo D. Esquinazi, Sergei Buga +8
In this work, we demonstrate that cutting diamond crystals with a laser (532~nm wavelength, 0.5~mJ energy, 200~ns pulse duration at 15~kHz) produces a nm thick surfac…
Influence of rhombohedral stacking order in the electrical resistance of bulk and mesoscopic graphite
M. Zoraghi, J. Barzola-Quiquia, M. Stiller +6
The electrical, in-plane resistance as a function of temperature of bulk and mesoscopic thin graphite flakes obtained from the same batch was investigated. Samples thicker t…
Trace element content and magnetic properties of commercial HOPG samples studied by ion beam microscopy and SQUID magnetometry
D. Spemann, P. Esquinazi, A. Setzer +1
In this study, the impurity concentration and magnetic response of nine highly oriented pyrolytic graphite (HOPG) samples with different grades and from different providers were de…
Defect-Induced Magnetism in Solids
P. Esquinazi, W. Hergert, D. Spemann +2
In the last years the number of nominally non-magnetic solids showing magnetic order induced by some kind of defects has increased continuously. From the single element material gr…
The role of hydrogen in room-temperature ferromagnetism at graphite surfaces
H. Ohldag, P. Esquinazi, E. Arenholz +4
We present a x-ray dichroism study of graphite surfaces that addresses the origin and magnitude of ferromagnetism in metal-free carbon. We find that, in addition to carbon stat…
Magnetic properties of polymerized C with Fe
A. Talyzin, A. Dzwilewski, L. Dubrovinsky +2
We provide evidence that high-pressure high-temperature (2.5 GPa and 1040 K) treatment of mixtures of iron with fullerene powders leads to the complete transformation of iron into…