Probing magnetic anisotropy in epitaxial La0.67Sr0.33MnO3 thin films and nanostructures via planar Hall effect

Le Zhang; Anil Rajapitamahuni; Yifei Hao; Xia Hong

doi:10.1117/12.2319249

20 September 2018 Probing magnetic anisotropy in epitaxial La_0.67Sr_0.33MnO₃thin films and nanostructures via planar Hall effect

Le Zhang, Anil Rajapitamahuni, Yifei Hao, Xia Hong

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107320F (2018) https://doi.org/10.1117/12.2319249
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

The ability to control and manipulate magnetic anisotropy in the colossal magnetoresistive (CMR) oxide (La,Sr)MnO₃ (LSMO) is critical for its implementation in magnetic memory applications. In this work, we employ the planar Hall effect (PHE) as a powerful tool to probe the magnetic anisotropy in LSMO thin films and nanostructures, where the magnetization is too small to be detected by conventional magnetometry techniques. By analyzing the angular- and magnetic field-dependences of the PHE, we deduced an in-plane biaxial magnetocrystalline anisotropy (MCA) energy of ~1.2x10⁵erg/cm² in LSMO thin films fully strained on (001) SrTiO₃ substrates. Creating nanoscale periodic depth modulation in LSMO establishes a uniaxial anisotropy with substantially enhanced MCA energy density, which is attributed to a high strain gradient sustained in the nanostructure. The energy competition between the biaxial and uniaxial MCA leads to multi-level resistance switching behavior in properly engineered LSMO nanostructures, which can be utilized to design the switching dynamics in magnetic memory devices. Our work points to the critical role of epitaxial strain in determining the MCA in CMR oxides, and provides an effective material strategy for engineering the magnetic properties of LSMO for novel spintronic applications with high thermal stability and high density data storage.

Citation Download Citation

Le Zhang, Anil Rajapitamahuni, Yifei Hao, and Xia Hong "Probing magnetic anisotropy in epitaxial La_0.67Sr_0.33MnO₃thin films and nanostructures via planar Hall effect", Proc. SPIE 10732, Spintronics XI, 107320F (20 September 2018); https://doi.org/10.1117/12.2319249

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available