In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 37, No. 6S ( 1998-06-01), p. 3769-
Abstract:
We have developed a new low-temperature ultrahigh vacuum scanning tunneling microscope
(UHV-STM) setup combined with a solenoid and a split-pair magnet. The STM can be operated in the 10 -11 mbar range, down to 7 K and in a rotatable magnetic field of up to 7 T perpendicular
and 2 T parallel to the sample surface. This LT-UHV-STM setup was applied to study the Landau level quantization in n-type
InAs(110). In addition to the observation of the Landau level splitting of the conduction band we were able to determine the energy dependence of the effective electron mass
due to the nonparabolicity of the conduction band. Furthermore, we have studied the scattering of electron waves at dopant atoms located several nanometers (1–20 nm) below
the surface. In a second study we have applied variable-temperature UHV-STM to investigate the temperature-dependent exchange splitting of a d z 2 -like surface state of Gd(0001) thin films.
The experimental results indicate that the high spatial localization of the surface state helps to maintain a local exchange splitting even above the Curie temperature but does not result in an
enhanced surface Curie temperature. Finally, we have demonstrated spin-polarized vacuum tunneling from a ferromagnetically-coated tip into the exchange-split surface state of Gd(0001).
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.37.3769
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1998
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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