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Nanomaterials 2019, 9(4), 574; https://doi.org/10.3390/nano9040574

Effects of Interface Induced Natural Strains on Magnetic Properties of FeRh

1
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16801, USA
3
Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
4
Electrical Engineering and Computer Sciences, University of California Berkeley, Berkeley, CA 94720, USA
*
Authors to whom correspondence should be addressed.
Received: 1 February 2019 / Revised: 14 March 2019 / Accepted: 27 March 2019 / Published: 9 April 2019
(This article belongs to the Special Issue From Nanomaterials to Intelligent Nanosystems)
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Abstract

FeRh is a unique alloy which shows temperature dependent phase transition magnetic properties. The lattice parameter (a) of this CsCl-type (B2) structure is 4.1712 Å. It undergoes a first order transition from antiferromagnetic (AFM) to ferromagnetic (FM) order at around 370K and hysteretic behavior while cooling and heating. This meta-magnetic transition of FeRh is accompanied by an isotropic expansion in the unit cell volume, which indicates strong coupling between magnetic and structural properties of FeRh. Consequently, the magnetic and transport properties, such as magnetoresistance (MR), are changed during the transition. Due to its unique thermo-magnetic behaviors, FeRh is very important for future spintronic devices. The structure could be applicable for MR devices such as memory, sensors, and many other applications. It is critical to understand how to systematically influence phase transition of FeRh from naturally applied strains. Here, we investigate magnetic properties of FeRh in different strain environments induced by the substrates with different lattice parameters. The study was performed using synchrotron radiation, temperature dependent magnetometry, and magnetic scanning probe microscopy in addition to Landau theory calculations. We found that the naturally induced strains could modulate the magnetic phase locally and globally. The presence of the segments from the nucleation of the ferromagnetic domains, with a very thin layer in the antiferromagnetic matrix and the domain growth, were observed gradually. Using the systematic phenomena, it could be used for immediate applications in the future generation of phase change random access memory (PC-RAM) devices. View Full-Text
Keywords: mixed states of FeRh; natural strains; strain modulation; FeRh; Phase Change; PC-memory mixed states of FeRh; natural strains; strain modulation; FeRh; Phase Change; PC-memory
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Hong, J.; Yang, T.; N’Diaye, A.T.; Bokor, J.; You, L. Effects of Interface Induced Natural Strains on Magnetic Properties of FeRh. Nanomaterials 2019, 9, 574.

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