Dr. Joon Sue Lee Profile

Dr. Joon Sue Lee

at Univ of Tennessee Knoxville

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 18 September 2018 Presentation

Unidirectional spin Hall and Rashba-Edelstein magnetoresistance in topological insulator-ferromagnet layer heterostructures (Conference Presentation)

Yang Lv, James Kally, Delin Zhang, Joon Sue Lee, Mahdi Jamali, Nitin Samarth, Jian-Ping Wang

Proceedings Volume 10732, 1073211 (2018) https://doi.org/10.1117/12.2323329

KEYWORDS: Heterojunctions, Spintronics, Logic devices, Dielectrics, Molecular beam epitaxy, Sputter deposition, Resistance, Thermoelectric materials, Magnetism, Signal generators

Read Abstract +

The recently discovered unidirectional spin-Hall magnetoresistance in nonmagnet-ferromagnet (NM-FM) bilayer structures is believed the only way to electrically sense the in-plane 180-degree magnetization rotation in such NM-FM systems without adding additional terminals or structures. On the other front, spintronic memory and logic devices involving topological insulators (TIs) are being studied intensively due to TI’s exciting potential of efficiently generate spins. In our work, we observed the unidirectional spin-Hall and Rashba−Edelstein magnetoresistance (USRMR) in topological insulator-ferromagnet (TI-FM) layer heterostructures for the first time. TI films (Bi2Se3 or (Bi1−xSbx)2Te3) were first grown by molecular beam epitaxy and then transferred to a magnetron sputtering chamber where the CoFeB and capping MgO were deposited. Then the stacks were patterned into Hall bars and tested with harmonic measurements in a Quantum Design PPMS. The measured longitudinal second harmonic resistance contains the USRMR signal plus contributions from other thermoelectric effects. Then series of transverse second harmonic measurements with various external magnetic field strengths were carried out to carefully determine the contributions of these effects. Finally, the data was analyzed, and results show non-zero USRMR. By varying the temperature, TI thickness and TI material and comparing the USRMR performances, we have also concluded that the topological surface states of TI played important roles in generating USRMR signal. The transport properties and conditions seem to govern heavily on the USRMR performance. And the largest USRMR was observed in 6 quintuple layer thick Bi2Se3 sample at 150K and being more than twice as large as the best reported USMR in Ta/Co samples.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years