Anisotropic optical and magnetic response in self-assembled TiN-CoFe₂ nanocomposites

Authors

Jiawei Song, Purdue University
Di Zhang, Purdue University, Los Alamos National Laboratory
Ping Lu, Sandia National Laboratories
Haohan Wang, University of Nebraska-Lincoln
X. S. Xu, University of Nebraska-LincolnFollow
Melissa L. Meyerson, Sandia National Laboratories
Samantha G. Rosenberg, Sandia National Laboratories
Julia Deitz, Sandia National Laboratories
Juncheng Liu, Purdue University
Xuejing Wang, Los Alamos National Laboratory
Xinghang Zhang, Purdue University

Date of this Version

2023

Citation

Published (2023) Materials Today Nano, 22, art. no. 100316

Comments

Used by permission.

Abstract

Transition metal nitrides (e.g., TiN) have shown tremendous promise in optical metamaterials for nanophotonic devices due to their plasmonic properties comparable to noble metals and superior high temperature stability. Vertically aligned nanocomposites (VANs) offer a great platform for combining two dissimilar functional materials with a one-step deposition technique toward multifunctionality integration and strong structural/property anisotropy. Here we report a two-phase nanocomposite design combining ferromagnetic CoFe₂ nanosheets in the plasmonic TiN matrix as a new hybrid plasmonic metamaterial. The hybrid metamaterials exhibit obvious anisotropic optical and magnetic responses, as well as a pronounced magneto-optical coupling response evidenced by MOKE measurement, owing to the novel vertically aligned structure. This work demonstrates a new TiN-based metamaterial with anisotropic properties and multi-functionality towards optical switchable spintronics, magnetic sensors and integrated optics