Modulating the Spin Seebeck Effect in Co2FeAl Heusler Alloy for Sensor Applications

Abstract

The thermoelectric conversion technique has been explored in a broad range of heat-flow sensors. In this context, the Spin Seebeck Effect emerges as an attractive candidate for biosensor applications, not only for the sensibility improvement but also for the power-saving electronic devices development. Here, we investigate the Longitudinal Spin Seebeck Effect in films with a Co 2 FeAl/W bilayer structure grown onto GaAs (100) substrate, systems having induced uniaxial magnetic anisotropy combined with cubic magnetic anisotropy. From numerical calculations, we address the magnetic behavior and thermoelectric response of the films. By comparing experiment and theory, we explore the possibility of modulating a thermoelectric effect by magnetic anisotropy. We show that the thermoelectric voltage curves may be modulated by the association of magnetic anisotropy induction and experimental parameters employed in the LSSE experiment.

Unraveling the role of magnetic anisotropy on the thermoelectric response: a theoretical and experimental approach

“…Moreover, the influence of the cubic magnetocrystalline anisotropy of Co 58.73 Fe 27.83 Al 13.44 Heusler alloys, grown onto substrates with distinct orientations, on thermoelectric effects has been studied by the LSSE [25]. For both situations, the results corroborate that the thermoelectric curves are strongly dependent on the magnitude and orientation of the magnetic field with respect to the anisotropies [23][24][25].…”

“…Recently, the modifications of the magnetic properties and thermoelectric effects, as ANE, have been explored in flexible magnetostrictive Co40Fe40B20 thin films with induced uniaxial magnetic anisotropy and under external stress [23]. Moreover, the influence of the cubic magnetocrystalline anisotropy of Co58.73Fe27.83Al13.44 Heusler alloys, grown onto substrates with distinct orientations, on thermoelectric effects has been studied by the LSSE [25]. For both situations, the results corroborate that the thermoelectric curves are strongly dependent on the magnitude and orientation of the magnetic field with respect to the anisotropies [23][24][25].…”

“…Moreover, the influence of the cubic magnetocrystalline anisotropy of Co 58.73 Fe 27.83 Al 13.44 Heusler alloys, grown onto substrates with distinct orientations, on thermoelectric effects has been studied by the LSSE [25]. For both situations, the results corroborate that the thermoelectric curves are strongly dependent on the magnitude and orientation of the magnetic field with respect to the anisotropies [23][24][25]. In addition, the thermoelectric measurements may be yet used to probe the magnetic anisotropy, as well as to identify the field ranges in which the anisotropic and Zeeman energy terms represent the major contribution to the magnetic free energy density governing the magnetization process [25].…”

A promising optoelectronic and thermoelectric response of full Heusler Na2TlX (X = Bi, Sb) alloys: a DFT approach

“…The ability to retain high temperature stability makes these alloys potential candidates for high power generation and shape memory applications [15,16]. Heusler alloys are extensively used in photovoltaic detectors, shape memory effects, LEDs, electro-optics, magnetic tunnel junctions and sensors [17][18][19][20][21][22]. The tunable optical gap, along with the high absorption coefficient and other important characteristics, make them attractive materials for optoelectronic applications [23].…”