Magnetic Properties of Proton Irradiated Fe 2.7 GeTe 2 Bulk Crystals
- PDF / 1,126,580 Bytes
- 6 Pages / 432 x 648 pts Page_size
- 79 Downloads / 170 Views
MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.277
Magnetic Properties of Proton Irradiated Fe2.7GeTe2 Bulk Crystals R. Olmos1, A. Cosio1, C. L. Saiz1, L. M. Martinez1, L. Shao2, Q. Wang3 and S. R. Singamaneni1* 1
Department of Physics, The University of Texas at El Paso, El Paso, TX 79968, USA
2
Department of Nuclear Engineering, Texas A&M University, College Station, TX 77845, USA
3
Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA
*[email protected]
Abstract
van der Waals (vdW) magnetic materials show promise in being the foundation for future spintronic technology. The magnetic behavior of Fe2.7GeTe2 (FGT), a vdW itinerant ferromagnet, was investigated before and after proton irradiation. Proton irradiation of the sample was carried out at a fluence of 1×1018 cm-2. The magnetization measurements revealed a small increase of saturation magnetization (Ms) of about 4% upon proton irradiation of the sample, in which, the magnetic field was applied parallel to the c-axis. Xray photoelectron spectroscopy for pristine and irradiated FGT revealed a general decrease in intensity after irradiation for Ge and Te and an increase in peak intensity of unavoidable surface iron oxide. Furthermore, no noticeable change in the Curie temperature (TC =152 K) is observed in temperature dependent magnetization variation. This work signifies the importance of employing protons in tuning the magnetic properties of vdW materials.
INTRODUCTION Two-dimensional (2D) van der Waals crystals have recently acquired significant attention due to their attractive properties such as ferromagnetism at the monolayer level and one million percent magnetoresistance [1-3]. Furthermore, the
Downloaded from https://www.cambridge.org/core. University of Texas Libraries, on 16 Sep 2019 at 18:20:00, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2019.277
magnetic properties of vdW crystals are being investigated as these 2D materials bring new prospects to the area of spintronic applications due to the ability to manipulate their magnetic properties depending on the number of layers that are present [3-7]. An example of promising candidates for long-range magnetism in monolayers are CrX3 (X = Cl, Br, I) and CrXTe3 (X = Si, Ge, Sn) compounds. To expand on the potential that vdW crystals may hold in applications, it has been seen that CrSiTe 3 exhibits ferromagnetic ordering at around 32 K in its bulk form and is enhanced to around 80 K in the monolayer form [4]. Although a desirable ferromagnetic behavior is obtained, in order for CrSiTe3 to be implemented into technology, the temperature at which it becomes ferromagnetic is considerably lower than the desired room temperature (300 K). Thus, it would need to be increased in order to be useful in actual applications. For that reason, many researchers are investigating different vdW crystals to understand if a desired ferromagnetic temperature can be reached. Moreov
Data Loading...
