Anomalously large ferromagnetic Curie temperature of epitaxial Bi2CoMnO6 thin films
We present the structural and physical properties of epitaxial Bi2CoMnO6 films grown on SrTiO3 and LaAlO3. They display magnetic hysteresis loop with 170 Oe coercivity and a 3.1µB/f.u. saturatio...
We present the structural and physical properties of epitaxial Bi2CoMnO6 films grown on SrTiO3 and LaAlO3. They display magnetic hysteresis loop with 170 Oe coercivity and a 3.1µB/f.u. saturatio...
In situ neutron diffraction study of aligning of crystal orientation in diamagnetic ceramics under magnetic fields
We have first studied the orientation process of -Al2O3 fine particles, using in situ neutron diffraction measurements on the particles in a liquid solvent under magnetic fields. The neutron diffracti...
We have first studied the orientation process of -Al2O3 fine particles, using in situ neutron diffraction measurements on the particles in a liquid solvent under magnetic fields. The neutron diffracti...
Map of metastable states for thin circular magnetic nanocylinders
Appl. Phys. Lett. 92, 112506 (2008); doi:10.1063/1.2898888
Published 19 March 2008
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Nanomagnetic systems of artificially shaped ferromagnetic islands recently became a popular subject due to their current and potential applications in spintronics [R. P. Cowburn, Nat. Mater. 6, 255 (2007)], magnetophotonics [A. Garcia-Martin, G. Armelles, and S. Pereira Phys. Rev. B 71, 205116 (2005)], and superconductivity. [D. S. Golubović, W. V. Pogosov, M. Morelle, and V. V. Moshchalkov, Phys. Rev. Lett. 92, 177904 (2004)] When the island size is close to the exchange length of magnetic material (around 15 nm), its magnetic structure becomes markedly different. It determines both static and dynamic magnetic properties of elements, but strongly depends on their shape and size. Here, we map this dependence for circular cylindrical islands of a few exchange lengths in size. We outline the region of metastability of C-type magnetic states, proving that they are indeed genuine and not a result of pinning on particle imperfections. A way to create the smallest particles with guaranteed magnetic vortex state at zero field becomes evident. It is expected that the map will help focus the efforts in planning of experiments and devices.
©2008 American Institute of Physics
| History: | Received 24 December 2007; accepted 28 February 2008; published 19 March 2008 |
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