Europhys. Lett.
Volume 70, Number 2, April 2005
Page(s) 244 - 249
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 30 March 2005
Europhys. Lett., 70 (2), pp. 244-249 (2005)
DOI: 10.1209/epl/i2004-10489-5

Magnetocohesive force of a ferromagnetic quantum point contact

Yu-Xian Li1, 2, Ke Xia1, 3 and Xiangrong Wang3

1  State Key Laboratory for Surface Physics, Institute of Physics, CAS P.O. Box 603, Beijing 100080, PRC
2  Department of Physics, Hebei Normal University - Shijiazhuang 050016, PRC
3  Department of Physics, HKUST - Clear Water Bay, Kowloon, HK, PRC

received 28 October 2004; accepted in final form 7 March 2005
published online 30 March 2005

The mechanical properties of a magnetic quantum point contact are studied based on scattering theory. When the alignment of magnetic moments changes from parallel to antiparallel, the cohesive force of the point contact will be modified. We call it the magnetocohesive-force effect. The effect of the magnetic alignment on the force can play an important role in the stability of a nanosize device. These findings also reveal a way of making energy transformation devices.

75.75.+a - Magnetic properties of nanostructures.
76.60.Es - Relaxation effects.
72.25.Mk - Spin transport through interfaces.

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