Probing Absolute Spin Polarization at the Nanoscale

被引：27

作者：

Eltschka, Matthias ^{[1
]}

Jaeck, Berthold ^{[1
]}

Assig, Maximilian ^{[1
]}

Kondrashov, Oleg V. ^{[2
]}

Skvortsov, Mikhail A. ^{[2
,3
,4
]}

Etzkorn, Markus ^{[1
]}

Ast, Christian R. ^{[1
]}

Kern, Klaus ^{[1
,5
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Moscow Inst Phys & Technol, Moscow 141700, Russia

[3] Skolkovo Inst Sci & Technol, Skolkovo 143025, Russia

[4] LD Landau Theoret Phys Inst, Chernogolovka 142432, Russia

[5] Ecole Polytech Fed Lausanne, Inst Phys Matiere Condensee, CH-1015 Lausanne, Switzerland

来源：

NANO LETTERS | 2014年 / 14卷 / 12期

关键词：

Spin-polarzied tunneling; spin-polarized STM; Meservey-Tedrow-Fulde effect; magnetic nanoislands; spin-filtering; TUNNEL-JUNCTIONS; ROOM-TEMPERATURE; MAGNETORESISTANCE; VANADIUM; STATE; FILMS;

D O I：

10.1021/nl5037947

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Probing absolute values of spin polarization at the nanoscale offers insight into the fundamental mechanisms of spin-dependent transport. Employing the Zeeman splitting in superconducting tips (Meservey-Tedrow-Fulde effect), we introduce a novel spin-polarized scanning tunneling microscopy that combines the probing capability of the absolute values of spin polarization with precise control at the atomic scale. We utilize our novel approach to measure the locally resolved spin polarization of magnetic Co nanoislands on Cu(111). We find that the spin polarization is enhanced by 65% when increasing the width of the tunnel barrier by only 2.3 angstrom due to the different decay of the electron orbitals into vacuum.

引用

页码：7171 / 7174

页数：4

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