Electrical-current-induced magnetic hysteresis in self-assembled vertically aligned nanopillar composites
Abstract
Magnetoresistive random-access memory (MRAM) is poised to become a next-generation information storage device. Yet, many materials challenges remain unsolved before it can become a widely used memory storage solution. Among them, an urgent need is to identify a material system that is suitable for downscaling and is compatible with low-power logic applications. Self-assembled, vertically aligned La2/3Sr1/3MnO3: ZnO nanocomposites, in which La2/3Sr1/3MnO3 (LSMO) matrix and ZnO nanopillars form an intertwined structure with coincident-site-matched growth occurring between the LSMO and ZnO vertical interfaces, may offer new MRAM applications by combining their superior electric, magnetic ( B ), and optical properties. Here, in this Rapid Communication, we show the results of electrical current induced magnetic hysteresis in magnetoresistance measurements in these nanopillar composites. We observe that when the current level is low, for example, 1 µA, the magnetoresistance displays a linear, negative, nonhysteretic B field dependence. Surprisingly, when a large current is used, I > 10 µA, a hysteretic behavior is observed when the B field is swept in the up and down directions. This hysteresis weakens as the sample temperature is increased. Finally, a possible spin-valve mechanism related to this electrical current induced magnetic hysteresis is proposed and discussed.
- Authors:
-
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Virginia, Charlottesville, VA (United States). Department of Materials Science and Engineering and Department of Electrical and Computer Engineering
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Univ. at Buffalo, NY (United States). Department of Materials Design and Innovation; Konkuk University, Seoul (South Korea). Dept. of Physics
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- OSTI Identifier:
- 1426813
- Alternate Identifier(s):
- OSTI ID: 1422257
- Report Number(s):
- SAND-2018-1699J
Journal ID: ISSN 2475-9953; PRMHAR; 660705; TRN: US1802576
- Grant/Contract Number:
- AC04-94AL85000; NA0003525; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 2; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Pan, W., Lu, P., Ihlefeld, J. F., Lee, S. R., Choi, E. S., Jiang, Y., and Jia, Q. X. Electrical-current-induced magnetic hysteresis in self-assembled vertically aligned La2/3Sr1/3MnO3:ZnO nanopillar composites. United States: N. p., 2018.
Web. doi:10.1103/PhysRevMaterials.2.021401.
Pan, W., Lu, P., Ihlefeld, J. F., Lee, S. R., Choi, E. S., Jiang, Y., & Jia, Q. X. Electrical-current-induced magnetic hysteresis in self-assembled vertically aligned La2/3Sr1/3MnO3:ZnO nanopillar composites. United States. https://doi.org/10.1103/PhysRevMaterials.2.021401
Pan, W., Lu, P., Ihlefeld, J. F., Lee, S. R., Choi, E. S., Jiang, Y., and Jia, Q. X. Thu .
"Electrical-current-induced magnetic hysteresis in self-assembled vertically aligned La2/3Sr1/3MnO3:ZnO nanopillar composites". United States. https://doi.org/10.1103/PhysRevMaterials.2.021401. https://www.osti.gov/servlets/purl/1426813.
@article{osti_1426813,
title = {Electrical-current-induced magnetic hysteresis in self-assembled vertically aligned La2/3Sr1/3MnO3:ZnO nanopillar composites},
author = {Pan, W. and Lu, P. and Ihlefeld, J. F. and Lee, S. R. and Choi, E. S. and Jiang, Y. and Jia, Q. X.},
abstractNote = {Magnetoresistive random-access memory (MRAM) is poised to become a next-generation information storage device. Yet, many materials challenges remain unsolved before it can become a widely used memory storage solution. Among them, an urgent need is to identify a material system that is suitable for downscaling and is compatible with low-power logic applications. Self-assembled, vertically aligned La2/3Sr1/3MnO3: ZnO nanocomposites, in which La2/3Sr1/3MnO3 (LSMO) matrix and ZnO nanopillars form an intertwined structure with coincident-site-matched growth occurring between the LSMO and ZnO vertical interfaces, may offer new MRAM applications by combining their superior electric, magnetic ( B ), and optical properties. Here, in this Rapid Communication, we show the results of electrical current induced magnetic hysteresis in magnetoresistance measurements in these nanopillar composites. We observe that when the current level is low, for example, 1 µA, the magnetoresistance displays a linear, negative, nonhysteretic B field dependence. Surprisingly, when a large current is used, I > 10 µA, a hysteretic behavior is observed when the B field is swept in the up and down directions. This hysteresis weakens as the sample temperature is increased. Finally, a possible spin-valve mechanism related to this electrical current induced magnetic hysteresis is proposed and discussed.},
doi = {10.1103/PhysRevMaterials.2.021401},
journal = {Physical Review Materials},
number = 2,
volume = 2,
place = {United States},
year = {2018},
month = {2}
}
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Figure 1: Structure characterization of self-assembled vertically aligned LSMO:ZnO nanopillars composites. (a) Schematic diagram of a nanopillars composite sample. (b) High resolution cross-section TEM image. The scale bar is 20 nm. (c) X-ray diffraction (XRD) pattern in the reciprocal lattice. LSMO and LAO peaks are marked.
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