Half-metallicity in highly L21-ordered CoFeCrAl thin films

Jin, Y.; Kharel, P.; Valloppilly, S. R.; Li, X. -Z.; Kim, D. R.; Zhao, G. J.; Chen, T. Y.; Choudhary, R.; Kashyap, A.; Skomski, R.; Sellmyer, D. J.

doi:10.1063/1.4964464

Title: Half-metallicity in highly L2₁-ordered CoFeCrAl thin films

Journal Article · Mon Oct 03 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4964464· OSTI ID:1465777

Jin, Y. ^[1]; Kharel, P. ^[2]; Valloppilly, S. R. ^[3]; Li, X. -Z. ^[3]; Kim, D. R. ^[4]; Zhao, G. J. ^[4];

^[4]; Choudhary, R. ^[5]; Kashyap, A. ^[5]; Skomski, R. ^[1]; Sellmyer, D. J. ^[1]

Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy; Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience
Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience; South Dakota State Univ., Brookings, SD (United States). Dept. of Physics
Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience
Arizona State Univ., Tempe, AZ (United States). Dept. of Physics
Indian Inst. of Technology, Mandi, Himachal Pradesh (India). School of Basic Sciences

The structural, magnetic, and electron-transport properties of Heusler-ordered CoFeCrAl thin films are investigated experimentally and theoretically. The films, sputtered onto MgO and having thicknesses of about 100 nm, exhibit virtually perfect single-crystalline epitaxy and a high degree of L2₁ chemical order. X-ray diffraction and transmission-electron microscopy show that the structure of the films is essentially of the L21 Heusler type. The films are ferrimagnetic, with a Curie temperature of about 390 K, and a net moment of 2 μ_B per formula unit. The room temperature resistivity is 175 μΩ cm; the carrier concentration and mobility determined from the low temperature (5 K) measurement are 1.2 × 10¹⁸ cm^-3 and 33 cm²/V s, respectively. In contrast to the well-investigated Heusler alloys such as Co₂(Cr_1-xFe_x)Al, the CoFeCrAl system exhibits two main types of weak residual A2 disorder, namely, Co-Cr disorder and Fe-Cr disorder, the latter conserving half-metallicity. Point-contact Andreev reflection yields a lower bound for the spin polarization, 68% at 1.85 K, but our structural and magnetization analyses suggest that the spin polarization at the Fermi level is probably higher than 90%. The high resistivity, spin polarization, and Curie temperature are encouraging in the context of spin electronics.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States); Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-04ER46152; SC0012670

OSTI ID:: 1465777

Alternate ID(s):: OSTI ID: 1328224

Journal Information:: Applied Physics Letters, Vol. 109, Issue 14; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Magnetic and magnetocaloric properties of Co _2-x Fe _x VGa Heusler alloys Schroeder, K.; Waybright, J.; Kharel, P. AIP Advances, Vol. 8, Issue 5 https://doi.org/10.1063/1.5006646	journal	May 2018
Structure and magnetism of NiFeMnGa _x Sn _1-x (x = 0, 0.25, 0.5, 0.75, 1.00) Heusler compounds Waybright, Jace; Halbritter, Lee; Dahal, Bishnu AIP Advances, Vol. 9, Issue 3 https://doi.org/10.1063/1.5068680	journal	March 2019
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Low magnetic damping for equiatomic CoFeMnSi Heusler alloy Bainsla, L.; Yilgin, R.; Tsujikawa, M. Journal of Physics D: Applied Physics, Vol. 51, Issue 49 https://doi.org/10.1088/1361-6463/aae4ef	journal	October 2018
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