| 1. |
- Iovan, Adrian, et al.
(author)
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Spin diode based on Fe/MgO double tunnel junction
- 2008
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In: Nano letters (Print). - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 8:3, s. 805-809
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Journal article (peer-reviewed)abstract
- We demonstrate a spin diode consisting of a semiconductor-free nanoscale Fe/MgO-based double tunnel junction. The device exhibits a near perfect spin-valve effect combined with a strong diode effect. The mechanism consistent with our data is resonant tunneling through discrete states in the middle ferromagnetic layer sandwiched by tunnel barriers of different spin-dependent transparency. The observed magnetoresistance is a record high > 1000%, essentially making the structure an on/off spin switch. This, combined with the strong diode effect, similar to 100, demonstrates a new device principle, promising for memory and reprogrammable logic applications.
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| 2. |
- Manchon, A., et al.
(author)
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Currents and torques due to spin-dependent diffraction in ferromagnetic/spin spiral bilayers
- 2008
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In: Journal of Physics. - : Institute of Physics (IOP). - 0953-8984 .- 1361-648X. ; 20:50, s. 505213-
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Journal article (peer-reviewed)abstract
- Spin-dependent transport through the interface between a ferromagnet and a spin spiral is investigated using both ballistic and diffusive models. We find that spin-dependent interferences lead to a new type of diffraction called 'spin diffraction'. It is shown that this spin diffraction leads to local spin and electrical current along the interface, as well as spin transfer torque acting on the spin spiral. This study also emphasizes that in highly inhomogeneous magnetic configurations, diffracted electrons must be taken into account to properly describe the spin transport.
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| 3. |
- Ryzhanova, N., et al.
(author)
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Quasi-two-dimensional extraordinary Hall effect
- 2009
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In: Physical Review B. Condensed Matter and Materials Physics. - : American Physical Society. - 1098-0121 .- 1550-235X. ; 80:2, s. 024410-
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Journal article (peer-reviewed)abstract
- Quasi-two-dimensional transport is investigated in a system consisting of a very thin 1 nm ferromagneticlayer sandwiched between two insulating layers. Using the mechanism of skew scattering to describe theextraordinary Hall effect EHE and calculating the conductivity tensor, we compare the quasi-two-dimensionalHall resistance with the Hall resistance of a massive sample. In this study, a mechanism of EHE geometricmechanism of EHE due to nonideal interfaces and volume defects is also proposed.
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| 4. |
- Salazar-Alvarez, German, et al.
(author)
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Direct evidence of imprinted vortex states in the antiferromagnet of exchange biased microdisks
- 2009
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In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 95:1, s. 012510-
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Journal article (peer-reviewed)abstract
- The magnetic domain structure of patterned antiferromagnetic/ferromagnetic Ir20Mn80/Ni80Fe20 bilayer microdisk arrays has been investigated using layer-specific polarized x-ray photoemission electron microscopy and magnetic circular dichroism. Magnetic imaging at the Fe and Mn L-edge resonances provided direct evidence of a vortex state imprinted into the antiferromagnet at the interface. The opposite magnetic contrast between the layers indicated a reversed chirality of the imprinted vortex state, and a quantitative analysis of the magnetic moment from the dichroism spectra showed that uncompensated Mn spins equivalent to about 60% of a monolayer of bulk Ir20Mn80 contributed to the imprinted information at the interface.
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| 5. |
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