Lecture image placeholder

Premium content

Access to this content requires a subscription. You must be a premium user to view this content.

Monthly subscription - $9.99Pay per view - $4.99Access through your institutionLogin with Underline account
Need help?
Contact us
Lecture placeholder background
VIDEO DOI: https://doi.org/10.48448/xhxe-k932

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Size dependent Magnetization Reversal Characteristics of Synthetic Antiferromagnetic Nanoplatelets

The synthetic antiferromagnetic (SAF) nanoplatelets (NPs) with perpendicular magnetic anisotropy (PMA) are of particular interest for torque-related applications due to their large anisotropy 1. However, previous research indicates that the coercivity (Hc) increases significantly for small structures with PMA due to thermally activated-magnetization reversal 2. As the size of NPs drops, larger field is required, and its distribution increases, to activate the NPs which is undesirable for applications. This raises a question of how the magnetization reversal characteristics of the SAF-PMA system scale with size.
In this work, we study the magnetization reversal process of PMA-SAF systems of different sizes and materials (CoB/Pt and CoFeB/Pt). The basic thin-film stack is shown in the insert of Fig 1. PMA-SAF nanoplatelets with different sizes are fabricated through electron beam lithography (EBL) and measured using polar magneto-optic Kerr effect (MOKE) magnetometry. One example of the fabricated nanoplatelets is shown in Fig 1. An increase of Hc and its distribution (indicated by the error bar in Fig 2.) is observed with decreasing size as shown in Fig 2. An overall smaller Hc is observed in CoFeB/Pt system compared to CoB/Pt system which can be attributed to the decrease of anisotropy and the different defect-nucleation distribution of the materials. A model based on a local anisotropy distribution and thermal activation is established to simulate the data 3. The model can accurately predict the Hc behavior, giving further insights into how the size, materials, and anisotropy affect the underlying reversal process.
In this talk, we present the size-depended magnetization reversal process of SAF NPs, discuss the physics based on the simulation, and propose the methods to control the switching distribution. This will pave the way to tune the activating magnetic field of PMA-SAF NPs for applications.


Transcript English (automatic)

Next from MMM 2022

Magnetic nanoprecipitates and interfacial spin disorder in zero field
technical paper

Magnetic nanoprecipitates and interfacial spin disorder in zero field

MMM 2022

+5Mathias Bersweiler
Mathias Bersweiler and 7 other authors

07 November 2022

Stay up to date with the latest Underline news!

Select topic of interest (you can select more than one)


  • All Lectures
  • For Librarians
  • Resource Center
  • Free Trial
Underline Science, Inc.
1216 Broadway, 2nd Floor, New York, NY 10001, USA

© 2023 Underline - All rights reserved