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Title: Electrical and magnetic properties of thin films of the spin-filter material CrVTiAl

Abstract

The spin-filter material CrVTiAl is a promising candidate for producing highly spin-polarized currents at room temperature in a nonmagnetic architecture. Thin films of compensated-ferrimagnetic CrVTiAl have been grown, and their electrical and magnetic properties have been studied. The resistivity shows two-channel semiconducting behavior with one disordered gapless channel and a gapped channel with activation energy ΔE = 0.1 – 0.2 eV. Magnetoresistance measurements to B = 35 T provide values for the mobilities of the gapless channel, leading to an order of magnitude difference in the carrier effective masses, which are in reasonable accord with our density-functional-theory-based results. The density of states and electronic band structure are computed for permutations of the four sublattices arranged differently along the (111) body diagonal, yielding metallic (Cr-V-Al-Ti), spin-gapless (Cr-V-Ti-Al), and spin-filtering (Cr-Ti-V-Al) phases. Robustness of the spin-gapless phase to substitutional disorder is also considered.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [3];  [4];  [1];  [5]
+ Show Author Affiliations
  1. Northeastern Univ., Boston, MA (United States)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. AGH - Univ. of Science and Technology, Krakow (Poland); Northeastern Univ., Boston, MA (United States)
  4. LUT University, Lappeenranta (Finland); Northeastern Univ., Boston, MA (United States)
  5. Northeastern Univ., Boston, MA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Complex Materials from First Principles (CCM); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); Northeastern Univ., Boston, MA (United States); Temple Univ., Philadelphia, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1577662
Alternate Identifier(s):
OSTI ID: 1546276
Grant/Contract Number:  
AC02-05CH11231; FG02-07ER46352; SC0012575
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics; Density of states; Magnetotransport; Spintronics; Antiferromagnets; Heusler alloy; Magnetic semiconductors; Density functional theory; Hall bar; Korringa-Kohn-Rostoker method; Magnetization measurements; Resistivity measurements; Sputtering

Citation Formats

Stephen, Gregory M., Lane, Christopher, Buda, Gianina, Graf, David, Kaprzyk, Stanislaw, Barbiellini, Bernardo, Bansil, Arun, and Heiman, Don. Electrical and magnetic properties of thin films of the spin-filter material CrVTiAl. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.224207.
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Stephen, Gregory M., Lane, Christopher, Buda, Gianina, Graf, David, Kaprzyk, Stanislaw, Barbiellini, Bernardo, Bansil, Arun, & Heiman, Don. Electrical and magnetic properties of thin films of the spin-filter material CrVTiAl. United States. https://doi.org/10.1103/physrevb.99.224207
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Stephen, Gregory M., Lane, Christopher, Buda, Gianina, Graf, David, Kaprzyk, Stanislaw, Barbiellini, Bernardo, Bansil, Arun, and Heiman, Don. Fri . "Electrical and magnetic properties of thin films of the spin-filter material CrVTiAl". United States. https://doi.org/10.1103/physrevb.99.224207. https://www.osti.gov/servlets/purl/1577662.
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@article{osti_1577662,
title = {Electrical and magnetic properties of thin films of the spin-filter material CrVTiAl},
author = {Stephen, Gregory M. and Lane, Christopher and Buda, Gianina and Graf, David and Kaprzyk, Stanislaw and Barbiellini, Bernardo and Bansil, Arun and Heiman, Don},
abstractNote = {The spin-filter material CrVTiAl is a promising candidate for producing highly spin-polarized currents at room temperature in a nonmagnetic architecture. Thin films of compensated-ferrimagnetic CrVTiAl have been grown, and their electrical and magnetic properties have been studied. The resistivity shows two-channel semiconducting behavior with one disordered gapless channel and a gapped channel with activation energy ΔE = 0.1 – 0.2 eV. Magnetoresistance measurements to B = 35 T provide values for the mobilities of the gapless channel, leading to an order of magnitude difference in the carrier effective masses, which are in reasonable accord with our density-functional-theory-based results. The density of states and electronic band structure are computed for permutations of the four sublattices arranged differently along the (111) body diagonal, yielding metallic (Cr-V-Al-Ti), spin-gapless (Cr-V-Ti-Al), and spin-filtering (Cr-Ti-V-Al) phases. Robustness of the spin-gapless phase to substitutional disorder is also considered.},
doi = {10.1103/physrevb.99.224207},
journal = {Physical Review B},
number = 22,
volume = 99,
place = {United States},
year = {Fri Jun 28 00:00:00 EDT 2019},
month = {Fri Jun 28 00:00:00 EDT 2019}
}
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https://doi.org/10.1103/physrevb.99.224207
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