Direct visualization of dipolar ferromagnetic domain structures in Co nanoparticle monolayers by electron holography
作者： Kazuo Yamamoto , Sara A. Majetich , Martha R. McCartney , Madhur Sachan , Saeki Yamamuro
DOI: 10.1063/1.2973675
关键词: Magnetic domain 、 Magnetization 、 Dipole 、 Ferromagnetism 、 Magnetic nanoparticles 、 Condensed matter physics 、 Vortex 、 Electron holography 、 Monolayer 、 Materials science
摘要: Electron holography has revealed dipolar ferromagnetic domain structures in ordered monolayer arrays of Co nanoparticles. In zero-field-cooling experiments, we demonstrate the formation micron-sized magnetically regions with transverse walls, and a spatially varying moment order parameter. Truncated vortex that can be modified by an applied field are observed near sample edges. The collectively magnetized state shows soft magnetic properties long-range is stable over times 1h at 108K.
scitation.org
elsevier.com
aip.org 
sci-hub.se 参考文章(25)
Akira Tonomura, Electron-Holographic Interferometry Springer, Berlin, Heidelberg. pp. 69- 106 ,(1999) , 10.1007/978-3-540-37204-2_7
Magnetism: Molecules to Materials IV Magnetism: Molecules to Materials IV. pp. 496- ,(2001) , 10.1002/9783527620548
M. Sachan, N. D. Walrath, S. A. Majetich, K. Krycka, Chi-Chang Kao, Interaction effects within Langmuir layers and three-dimensional arrays of ε-Co nanoparticles Journal of Applied Physics. ,vol. 99, ,(2006) , 10.1063/1.2168438
A. J. Bennett, J. M. Xu, Simulating collective magnetic dynamics in nanodisk arrays Applied Physics Letters. ,vol. 82, pp. 2503- 2505 ,(2003) , 10.1063/1.1566792
S A Majetich, M Sachan, Magnetostatic interactions in magnetic nanoparticle assemblies: energy, time and length scales Journal of Physics D. ,vol. 39, ,(2006) , 10.1088/0022-3727/39/21/R02
Victor F. Puntes, Pau Gorostiza, Deborah M. Aruguete, Neus G. Bastus, A. Paul Alivisatos, Collective behaviour in two-dimensional cobalt nanoparticle assemblies observed by magnetic force microscopy Nature Materials. ,vol. 3, pp. 263- 268 ,(2004) , 10.1038/NMAT1094
T. Hirayama, J. Chen, T. Tanji, A. Tonomura, Dynamic observation of magnetic domains by on-line real-time electron holography Ultramicroscopy. ,vol. 54, pp. 9- 14 ,(1994) , 10.1016/0304-3991(94)90088-4
M. R. Roser, L. R. Corruccini, Dipolar ferromagnetic order in a cubic system. Physical Review Letters. ,vol. 65, pp. 1064- 1067 ,(1990) , 10.1103/PHYSREVLETT.65.1064
J. M. Luttinger, L. Tisza, Theory of Dipole Interaction in Crystals Physical Review. ,vol. 70, pp. 954- 964 ,(1946) , 10.1103/PHYSREV.70.954
J. P. Bouchaud, P. G. Zérah, Dipolar ferromagnetism: A Monte Carlo study. Physical Review B. ,vol. 47, pp. 9095- 9097 ,(1993) , 10.1103/PHYSREVB.47.9095