Publications by Thorsten Hesjedal
Structure of epitaxial L10-FePt/MgO perpendicular magnetic tunnel junctions
Applied Physics Letters 102 (2013) 062403
Perpendicular magnetic tunnel junctions (p-MTJs) with MgO barriers are interesting for high-density information-storage devices. Chemically ordered L10-FePt is a potential electrode due to its large perpendicular magnetocrystalline anisotropy. To-date, a single theoretical study on L10-FePt/MgO p-MTJ based on an idealized structure reported significant dependence of spin-dependent tunneling on interface structure. [Y. Taniguchi et al., IEEE Trans. Magn. 44, 2585 (2008).] We report a structural study of epitaxial L10-FePt(001)[110]//MgO(001)[110]//L10-FePt(001)[110] p-MTJs, focusing on the interfaces using aberration-corrected scanning transmission electron microscopy. Interfaces are semi-coherent, with oxygen atomic-columns of MgO located opposite to iron atomic-columns in L10-FePt. Up to three lattice planes show atomic-column steps, the origin of which is attributed to antiphase boundaries in L10-FePt.
Interface Characterization of Epitaxial Fe/MgO/Fe Magnetic Tunnel Junctions
Journal of Nanoscience and Nanotechnology 12 (2012) 1006-1023
Magnetic reversal in a YFe₂ dominated DyFe₂/YFe₂ multilayer film
Applied Physics Letters 101 (2012) 072412
Transverse magnetic exchange springs in a DyFe2/YFe2 superlattice
Physical Review B: Condensed Matter and Materials Physics 86 (2012) 174420
Using a history-dependent method, it is possible to prepare magnetic superlattices, consisting of alternating hard and soft layers, in transverse exchange spring states. The procedure, which involves both physical rotation and magnetization routines, is illustrated using a (110)-oriented [DyFe2(60 Å)/YFe2(240 Å)]15 multilayer film. In small applied fields, it is shown that the magnetic response of a transverse magnetic exchange spring is reversible. However, in fields of up to 14 T, the Dy moments are pulled up out of their local in-plane [00¯1] minimum into an out-of-plane [100] (or equivalent [010]) axis. The reversible transverse exchange spring state is then lost. Thereafter, the magnetic loop is characterized by an irreversible out-of-plane magnetic exchange spring state.
Electronic structure of Fe and Co magnetic adatoms on Bi 2Te 3 surfaces
Physical Review B - Condensed Matter and Materials Physics 86 (2012)
Micromagnetic Investigation of the S-State Reconfigurable Logic Element
IEEE Transactions on Magnetics (2012)
Methane chemical vapor deposition on transition metal/GaAs samples - A possible route to Haeckelite carbon nanotubes?
Surface and Interface Analysis 44 (2012) 456-465
An Undergraduate Nanotechnology Engineering Laboratory Course on Atomic Force Microscopy
IEEE Transactions on Education (2010)
Are carbon nanotubes a naturally occurring material? Hints from methane CVD using lava as a catalyst
Current Nanoscience 7 (2011) 294-296
Development of an electronic nose sensing platform for undergraduate education in nanotechnology
European Journal of Physics 32 (2011) 675-686
Continuous roll-to-roll growth of graphene films by chemical vapor deposition
Applied Physics Letters 98 (2011)
Micromagnetic analysis of unusual, V-shaped domain transitions in MnAs nanowires
Journal of Magnetism and Magnetic Materials 323 (2011) 1840-1845
An undergraduate nanotechnology engineering laboratory course on atomic force microscopy
IEEE Transactions on Education 54 (2011) 428-441
Surface acoustic wave-assisted scanning probe microscopy - A summary
Reports on Progress in Physics 73 (2010)
Investigation of slanted and V-shaped domain walls in MnAs films
Journal of Applied Physics 105 (2009)
Comparative study of the influence of the solvent on the catalytic growth of carbon nanotubes
Microelectronic Engineering 85 (2008) 156-160
Magnetic coupling of ferromagnetic stripe arrays: Analytical model for the α-β -phase coexistence regime of MnAs/GaAs(001)
Physical Review B - Condensed Matter and Materials Physics 78 (2008)