In-situ magnetization/heating electron holography to study the magnetic ordering in arrays of nickel metallic nanowires.

Eduardo Ortega,Jason G Giuliani,Carlos Monton,Ulises Santiago,Arturo Ponce

doi:10.1063/1.5007671

Abstract

Magnetic nanostructures of different size, shape, and composition possess a great potential to improve current technologies like data storage and electromagnetic sensing. In thin ferromagnetic nanowires, their magnetization behavior is dominated by the competition between magnetocrystalline anisotropy (related to the crystalline structure) and shape anisotropy. In this way electron diffraction methods like precession electron diffraction (PED) can be used to link the magnetic behavior observed by Electron Holography (EH) with its crystallinity. Using off-axis electron holography under Lorentz conditions, we can experimentally determine the magnetization distribution over neighboring nanostructures and their diamagnetic matrix. In the case of a single row of nickel nanowires within the alumina template, the thin TEM samples showed a dominant antiferromagnetic arrangement demonstrating long-range magnetostatic interactions playing a major role.

Highlights

High-density arrays of magnetic nanowires (NWs) have attracted significant interest due to their expected technological applications in perpendicular recording media,[1] magnetoelectronic devices,[2] sensors,[3,4] and power devices.[5]
The magnetic measurements of the complete array are performed using vibrating sample magnetometers (VSM),[9,10] but only a few studies have been done to analyze the local response of the nanowires-anodic aluminum oxide (AAO) composite.[11,12,13]
We characterized the microstructure of electrodeposited Nickel nanowires using transmission electron microscopy (TEM) related techniques

Summary

Introduction

High-density arrays of magnetic nanowires (NWs) have attracted significant interest due to their expected technological applications in perpendicular recording media,[1] magnetoelectronic devices,[2] sensors,[3,4] and power devices.[5]. In-situ magnetization/heating electron holography to study the magnetic ordering in arrays of nickel metallic nanowires

Results

Conclusion