Publication

Strong out-of-plane magnetic anisotropy of Fe adatoms on Bi2Te3

Oleg Yazyev, Gabriel Albert Autes, Artem Pulkin
2014
Journal Articles

Abstract

The electronic and magnetic properties of individual Fe atoms adsorbed on the surface of the topological insulator Bi2Te3(111) are investigated. Scanning tunneling microscopy and spectroscopy prove the existence of two distinct types of Fe species, while our first-principles calculations assign them to Fe adatoms in the hcp and fcc hollow sites. The combination of x-ray magnetic circular dichroism measurements and angular dependent magnetization curves reveals out-of-plane anisotropies for both species with anisotropy constants of K-fcc = (10 +/- 4) meV/atom and K-hcp = (8 +/- 4) meV/atom. These values are well in line with the results of calculations.

Official source

https://infoscience.epfl.ch/entities/publication/c9082015-2b1e-42b0-b5b4-f9872580eb3c

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Oleg Yazyev, Gabriel Albert Autes, Artem Pulkin
2014
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c9082015-2b1e-42b0-b5b4-f9872580eb3c

About this result

Related concepts (28)

Atomic force microscopy

Atomic force microscopy (AFM) or scanning force microscopy (SFM) is a very-high-resolution type of scanning probe microscopy (SPM), with demonstrated resolution on the order of fractions of a nanometer, more than 1000 times better than the optical diffraction limit. Atomic force microscopy (AFM) is a type of scanning probe microscopy (SPM), with demonstrated resolution on the order of fractions of a nanometer, more than 1000 times better than the optical diffraction limit.

Scanning tunneling microscope

A scanning tunneling microscope (STM) is a type of microscope used for imaging surfaces at the atomic level. Its development in 1981 earned its inventors, Gerd Binnig and Heinrich Rohrer, then at IBM Zürich, the Nobel Prize in Physics in 1986. STM senses the surface by using an extremely sharp conducting tip that can distinguish features smaller than 0.1 nm with a 0.01 nm (10 pm) depth resolution. This means that individual atoms can routinely be imaged and manipulated.

Anisotropy

Anisotropy (ˌaenaɪˈsɒtrəpi,_ˌænɪ-) is the structural property of non-uniformity in different directions, as opposed to isotropy. An anisotropic object or pattern has properties that differ according to direction of measurement. For example many materials exhibit very different properties when measured along different axes: physical or mechanical properties (absorbance, refractive index, conductivity, tensile strength, etc.). An example of anisotropy is light coming through a polarizer.

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