Prediction of the bias voltage dependent magnetic contrast in spin-polarized scanning tunneling microscopy

Palotás, Krisztián (2013) Prediction of the bias voltage dependent magnetic contrast in spin-polarized scanning tunneling microscopy. Physical Review B, 87 (2). ISSN 1098-0121

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Abstract

This work is concerned with the theoretical description of the contrast, i.e., the apparent height difference between two lateral surface positions on constant current spin-polarized scanning tunneling microscopy (SP-STM) images. We propose a method to predict the bias voltage dependent magnetic contrast from single-point tunneling current or differential conductance measurements, without the need of scanning large areas of the surface. Depending on the number of single-point measurements, the bias positions of magnetic contrast reversals and of the maximally achievable magnetic contrast can be determined. We validate this proposal by simulating SP-STM images on a complex magnetic surface employing a recently developed approach based on atomic superposition. Furthermore, we show evidence that the tip electronic structure and magnetic orientation have a major effect on the magnetic contrast. Our theoretical prediction is expected to inspire experimentalists to considerably reduce measurement efforts for determining the bias-dependent magnetic contrast on magnetic surfaces.

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