University of Illinois Urbana-Champaign

In-plane magneto-crystalline anisotropy of magnetic kagome intermetallics

Qu, Kejian

Content Files
QU-DISSERTATION-2023.pdf

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https://hdl.handle.net/2142/121504

Description

Title
In-plane magneto-crystalline anisotropy of magnetic kagome intermetallics
Author(s)
Qu, Kejian
Issue Date
2023-07-12
Director of Research (if dissertation) or Advisor (if thesis)
Shoemaker, Daniel P
Doctoral Committee Chair(s)
Cooper, Lance
Committee Member(s)
  • Mahmood, Fahad
  • Kuo, Eric
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • magneto-crystalline anisotropy
  • information storage
Abstract
Antiferromagnetic (AFM) materials are better candidates than ferromagnetic (FM) counterparts for information storage due to the faster switching rate and the inability to affect neighboring domains. Magneto-crystalline anisotropy (MCA) describes the anisotropic magnetic response of a crystalline material along different directions. This energy anisotropy can be utilized for potential information storage. Materials with an in-plane magnetic structure is preferred due to the ease of magnetic switching. In this study, kagome intermetallic family RMn6Sn6 (R = Lu, Er, Y, and Dy) is investigated. After verifying their magnetic structure and properties, the ab-plane MCA is studied from torque magnetometry measurements. It is found that ErMn6Sn6 and DyMn6Sn6 show a 6-fold ab plane torque symmetry, demonstrating their information writing capability, while LuMn6Sn6 and YMn6Sn6 do not show a 6-fold ab-plane torque symmetry. For ErMn6Sn6, anisotropic magneto-resistance measurements showed a 6-fold symmetry in ab-plane as well, demonstrating the information reading capability. This study serves as a successful example of utilization of existing materials for information storage with in-plane MCA.
Graduation Semester
2023-08
Type of Resource
Thesis
Handle URL
https://hdl.handle.net/2142/121504
Copyright and License Information
Copyright 2023 Kejian Qu

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