In-plane magneto-crystalline anisotropy of magnetic kagome intermetallics

Qu, Kejian

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

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

Copyright and License Information

Copyright 2023 Kejian Qu

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