Simulation of spin-polarized scanning tunneling microscopy on complex magnetic surfaces: Case of a Cr monolayer on Ag(111)

被引：16

作者：

Palotas, Krisztian ^{[1
]}

Hofer, Werner A. ^{[2
]}

Szunyogh, Laszlo ^{[1
]}

机构：

[1] Budapest Univ Technol & Econ, Dept Theoret Phys, H-1111 Budapest, Hungary

[2] Univ Liverpool, Surface Sci Res Ctr, Liverpool L69 3BX, Merseyside, England

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 17期

基金：

匈牙利科学研究基金会;

关键词：

UNCONSTRAINED NONCOLLINEAR MAGNETISM; TOTAL-ENERGY CALCULATIONS; AUGMENTED-WAVE METHOD; ATOMIC-SCALE; BASIS-SET; NANOSCALE; SPECTROSCOPY; SPACE;

D O I：

10.1103/PhysRevB.84.174428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose an atom-superposition-based method for simulating spin-polarized scanning tunneling microscopy (SP-STM) from first principles. Our approach provides bias-dependent STM images in high spatial resolution, with the capability of using either constant current or constant height modes of STM. In addition, topographic and magnetic contributions can clearly be distinguished, which are directly comparable to results of SP-STM experiments in the differential magnetic mode. Advantages of the proposed method are that it is computationally cheap, it is easy to parallelize, and it can employ the results of any ab initio electronic structure code. Its capabilities are illustrated for the prototype frustrated hexagonal antiferromagnetic system, Cr monolayer on Ag(111) in a noncollinear magnetic 120 degrees Neel state. We show evidence that the magnetic contrast is sensitive to the tip electronic structure, and this contrast can be reversed depending on the bias voltage.

引用

页数：11

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