Magnetic field observation in a magnetic tunnel junction by scanning transmission electron microscopy-Reference-Cited by-同舟云学术

Magnetic field observation in a magnetic tunnel junction by scanning transmission electron microscopy

Published:2023-12-29 Issue: Volume: Page:
ISSN:2050-5698
Container-title:Microscopy
language:en
Short-container-title:

Author:

Kohno Yuji¹,Seki Takehito²³^ORCID,Tsuruoka Shun⁴,Ohya Shinobu⁴⁵⁶,Shibata Naoya²⁷

Affiliation:

1. JEOL Ltd , 3-1-2, Musashino, Akishima, Tokyo 196-8558, Japan

2. Institute of Engineering Innovation, School of Engineering, The University of Tokyo , Yayoi 2-11-16, Bunkyo-ku, Tokyo 113-8656, Japan

3. PRESTO, Japan Science and Technology Agency , Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan

4. Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

5. Center for Spintronics Research Network (CSRN), School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

6. Institute for Nano Quantum Information Electronics (NanoQuine), The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

7. Nanostructures Research Laboratory, Japan Fine Ceramic Center , 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan

Abstract

Abstract A magnetic tunnel junction (MTJ) consists of two ferromagnetic layers separated by a thin insulating layer. MTJs show tunnel magnetoresistance effect, where the resistance in the direction perpendicular to the insulator layer drastically changes depending on the magnetization directions (parallel or antiparallel) in the ferromagnetic layers. However, direct observation of local magnetizations inside MTJs has been challenging. In this study, we demonstrate direct observation of magnetic flux density distribution inside epitaxially grown Fe/MgO/Fe layers using differential phase contrast scanning transmission electron microscopy. By utilizing newly developed tilt-scan averaging system for suppressing diffraction contrasts, we clearly visualize parallel and antiparallel states of ferromagnetic layers at nanometer resolution.

Funder

JST ERATO

JSPS KAKENHI

JST PRESTO

Publisher

Oxford University Press (OUP)

Subject

Radiology, Nuclear Medicine and imaging,Instrumentation,Structural Biology

Link

https://academic.oup.com/jmicro/advance-article-pdf/doi/10.1093/jmicro/dfad063/56487463/dfad063.pdf

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