Characterization of Fe/W spin-polarized tips by means of holographic TEM and spin-polarized STS of optically pumped p-GaAs

Author

Matsuda, T. ; Tonomura, A. ; Yamada, T.K. ; Okuyama, D. ; Mizuno, N. ; De Parga, A. L Vazquez V ; van Kempen, H. ; Mizoguchi, T.

Author_Institution

Frontier Res. Syst., Inst. of Phys. & Chem. Res., Saitama, Japan

Volume

41

Issue

10

fYear

2005

Firstpage

3727

Lastpage

3729

Abstract

Holographic transmission electron microscopy showed that magnetic flux does not diverge from the top of an Fe-coated W tip indicating the in-plane magnetization at the apex of successful spin-polarized tips. A dependence of differential conductivities of GaAs with Fe-coated W tips on the helicity of illuminating laser light was confirmed at negative sample bias where partially spin-polarized electrons in the conduction band of p-GaAs tunnel into spin-dependent Fe empty states while no dependence of those with nonmagnetic W tips.

Keywords

III-V semiconductors; electron spin polarisation; gallium arsenide; holography; iron; magnetic flux; magnetic tunnelling; magnetisation; transmission electron microscopy; tungsten; Fe; GaAs; W; electron spin polarization; holographic transmission electron microscopy; in-plane magnetization; magnetic field measurement; magnetic flux; magnetic tunneling; optical pumping; scanning tunneling spectroscopy; spin-polarized STS; spin-polarized electrons; spin-polarized tips; Electron optics; Holographic optical components; Holography; Iron; Magnetic flux; Magnetic force microscopy; Magnetization; Optical pumping; Sociotechnical systems; Transmission electron microscopy; Magnetic field measurement; optical pumping; spectroscopy; tunneling;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2005.854672

Filename

1519425