The remarkable difference between surface and step atoms in the magnetic anisotropy of two-dimensional nanostructures

Nature Materials

Volumn 2, Issue 8, 2003, Pages 546-551

  Rusponi, S ^a   Cren, T ^a   Weiss, N ^a   Epple, M ^a   Buluschek, P ^a   Claude, L ^a   Brune, H ^a  

^a EPFL   (Switzerland)

Author keywords

[No Author keywords available]

Indexed keywords

ANISOTROPY; BIMETALS; HARDNESS; MAGNETIC ANISOTROPY; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; PARTICLE SIZE ANALYSIS; SPATIAL VARIABLES MEASUREMENT; SURFACE MEASUREMENT; TEMPERATURE;

ATOMIC SCALE CHARACTERIZATION; BIMETALLIC CORE-SHELL NANOSTRUCTURE; MAGNETIC ANISOTROPY ENERGY; TWO DIMENSIONAL NANOSTRUCTURES;

NANOSTRUCTURED MATERIALS;

COBALT; PLATINUM;

ANISOTROPY; ARTICLE; CHEMICAL STRUCTURE; CHEMISTRY; COMPARATIVE STUDY; CONFORMATION; CRYSTALLOGRAPHY; EVALUATION; INSTRUMENTATION; MAGNETISM; MATERIALS TESTING; METHODOLOGY; NANOTECHNOLOGY; SCANNING ELECTRON MICROSCOPY; SURFACE PROPERTY; VALIDATION STUDY;

ANISOTROPY; COBALT; CRYSTALLOGRAPHY; MAGNETICS; MATERIALS TESTING; MICROSCOPY, ELECTRON, SCANNING; MODELS, MOLECULAR; MOLECULAR CONFORMATION; NANOTECHNOLOGY; PLATINUM; SURFACE PROPERTIES;

EID: 0042285085     PISSN: 14761122     EISSN: None     Source Type: Journal    
DOI: 10.1038/nmat930     Document Type: Article

References (28)

1. Chou, S.Y. Patterned magnetic nanostructures and quantized magnetic disks. IEEE Proc. 85, 652-671 (1997).
2. Harris, J. & Awschalom, D. Thin films squeeze out domains. Phys. World 19-20 (Jan, 1999).
3. Albrecht, M., Rettner, C. T., Moser, A., Best, M. E. & Terris, B. D. Recording performance of high-density patterned perpendicular magnetic media. Appl. Phys. Lett. 81, 2875-2877 (2002).
4. Plumer, M. L., Ek, J. v. & Weller, D. (eds) The Physics of Ultra-High-Density Magnetic Recording (Springer, Berlin, 2001).
5. Woods, S. I., Kirtley, J. R., Sun, S. & Koch, R. H. Direct investigation of superparamagnetism on Co nanoparticles films. Phys. Rev. Lett. 87, 137205 (2001).
6. Petit, C., Taleb, A. & Pileni, M. P. Self-organization of magnetic nanosized cobalt particles. Adv. Mater. 10, 259-261 (1998).
7. Puntes, V. F., Krishnan, K. M. & Alivisatos, P. Synthesis, self-assembly, and magnetic behavior of a two-dimensional superlattice of single-crystal ε-Co particles. Appl. Phys. Lett. 78, 2187-2189 (2001).
8. Sun, S., Murray, C. B., Weller, D., Folks, L. & Moser, A. Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices. Science 287, 1989-1992 (2000).
9. Jamet, M. et al. Magnetic anisotropy of a single cobalt nanocluster. Phys. Rev. Lett. 86, 4676-4679 (2001).
10. Held, G. A., Grinstein, G., Doyle, H., Sun, S. & Murray, C. B. Competing interactions in dispersions of superparamagnetic nanoparticles. Phys. Rev. B 64, 012408 (2001).
11. Black, C. T., Murray, C. B., Sandstrom, R. L. & Sun, S. Spin-dependent tunneling in self-assembled cobalt-nanocrystal superlattices. Science 290, 1131-1134 (2000).
12. Fruchart, O, et al. Vertical self-organization of epitaxial magnetic nanostructures. J. Magn. Magn. Mater. 239, 224-227 (2002).
13. Brune, H., Giovannini, M., Bromann, K. & Kern, K. Self-organized growth of nanostructure arrays on strain-relief patterns. Nature, 394, 451-453 (1998).
14. Repain, V., Baudot, G., Ellmer, H. & Rousset, S. Two-dimensional long-range-ordered growth of uniform cobalt nanostructures on a Au(111) vicinal template. Europhys. Lett. 58, 730-736 (2002).
15. Brune, H., Romainczyk, C., Röder, H. & Kern, K. Mechanism of the transition from fractal to dendritic growth of surface aggregates. Nature 369, 469-471 (1994).
16. Wernsdorfer, W. et al. Experimental evidence of the Néel-Brown model of magnetization reversal. Phys. Rev. Lett. 78, 1791-1794 (1997)
17. Kinzel, W. & Fischer, K. H. Dynamics of spin glasses. Solid State Commun. 23, 687-690 (1977).
18. Koide, T. et al. Direct Determination of interfacial magnetic moments with a magnetic phase transition in Co nanoclusters on Au(111). Phys. Rev. Lett. 87, 257201 (2001).
19. Wu, R., Li, C. & Freeman, A. J. Structural, electronic and magnetic properties of Co/Pd(111) and Co/Pt(111). J. Magn. Magn. Mater. 99, 71-80 (1991).
20. Nakajima, N. et al. Perpendicular magnetic anisotropy caused by interfacial hybridization via enhanced orbital moment in Co/Pt multilayers: magnetic circular x-ray dichroism study. Phys. Rev. Lett. 81, 5229-5232 (1998).
21. Ferrer, S. et al. Surface X-ray diffraction from Co/Pt(111) ultrathin films and alloys: Structure and magnetism. Phys. Rev. B 56, 9848-9857 (1997).
22. Aharoni, A. Demagnetizing factors for rectangular ferromagnetic prisms. J. Appl. Phys. 83, 3432-3434 (1998).
23. Gambardella, P. et al. Ferromagnetism in one-dimensional monatomic metal chains. Nature 416, 301-304 (2002).
24. Chantrell, R. W., Walmsley, N., Gore, J. & Maylin, M. Calculations of the susceptibility of interacting superparamagnetic particles. Phys. Rev. B 63, 024410 (2000).
25. Haginoya, C. et al. Magnetic nanoparticle array with perpendicular crystal magnetic anisotropy. J. Appl. Phys. 85, 8327-8331 (1999).
26. Weber, W., Back, C. H., Bischof, A., Pescia, D. & Allenspach, R. Magnetic switching in cobalt films by adsorption of copper. Nature 374, 788-790 (1995).
27. Dürr, H. A. et al. Spin and orbital magnetization in self-assembled Co clusters on Au(111). Phys. Rev. B 59, R701-R704 (1999).
28. Ohresser, P., Brookes, N. B., Padovani, S., Scheurer, F. & Bulou, H. Magnetism of small Fe clusters on Au(111) studied by x-ray magnetic circular dichroism. Phys. Rev. B 64, 104429 (2001).