Magnetotransport Properties of Ferromagnetic Nanoparticles in a Semiconductor Matrix Studied by Precise Size-Selective Cluster Ion Beam Deposition

被引：7

作者：

Gack, Nicolas ^{[1
]}

Iankevich, Gleb ^{[1
]}

Benel, Cahit ^{[1
]}

Kruk, Robert ^{[1
]}

Wang, Di ^{[1
,2
]}

Hahn, Horst ^{[1
,3
]}

Reisinger, Thomas ^{[1
]}

机构：

[1] Karlsruhe Inst Technol, Inst Nanotechnol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[2] Karlsruhe Inst Technol, Karlsruhe Nano Micro Facil, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[3] Tech Univ Darmstadt, Inst Mat Sci, Otto Berndt Str 3, D-64206 Darmstadt, Germany

来源：

NANOMATERIALS | 2020年 / 10卷 / 11期

基金：

欧盟地平线“2020”;

关键词：

amorphous; germanium; semiconductor; iron; clusters; nanoparticles; nanocomposite; co-deposition; magnetoresistance; tunneling; GIANT MAGNETORESISTANCE; TEMPERATURE-DEPENDENCE; MAGNETIC-PROPERTIES; METAL; CONDUCTION; ANISOTROPY; PARTICLES; TRANSPORT; SILICON; PHASE;

D O I：

10.3390/nano10112192

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The combination of magnetic and semiconducting properties in one material system has great potential for integration of emerging spintronics with conventional semiconductor technology. One standard route for the synthesis of magnetic semiconductors is doping of semiconductors with magnetic atoms. In many semiconductor-magnetic-dopant systems, the magnetic atoms form precipitates within the semiconducting matrix. An alternative and controlled way to realize such nanocomposite materials is the assembly by co-deposition of size-selected cluster ions and a semiconductor. Here we follow the latter approach to demonstrate that this fabrication route can be used to independently study the influence of cluster concentration and cluster size on magneto-transport properties. In this case we study Fe clusters composed of approximately 500 or 1000 atoms soft-landed into a thermally evaporated amorphous Ge matrix. The analysis of field and temperature dependent transport shows that tunneling processes affected by Coulomb blockade dominate at low temperatures. The nanocomposites show saturating tunneling magnetoresistance, additionally superimposed by at least one other effect not saturating upon the maximum applied field of 6 T. The nanocomposites' resistivity and the observed tunneling magnetoresistance depend exponentially on the average distance between cluster surfaces. On the contrary, there is no notable influence of the cluster size on the tunneling magnetoresistance.

引用

页码：1 / 27

页数：27