Giant magnetoimpedance effect in Co2FeAl single layered and Co2FeAl/Ag multilayered films in amorphous substrates

Silva, A.M.; Escobar, Vivian Montardo; Callegari, Gustavo Luiz; Agra, K.; Chesman, C.; Bohn, F.; Corrêa, M.A.

doi:10.1016/j.matlet.2015.04.147

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…4(a) and 4(b)], where the external magnetic ¯eld and electrical ac current are applied perpendicularly to the easy magnetization axis [see Fig. 1(d)], the curves present a double peak structure for the whole frequency range, as expected, 13,16 since the ac ¯eld generating by the I ac current is parallel to the easy magnetization axis. At the intermediate frequency range, the R peaks position is close to the H s values veri¯ed through the magnetization curves.…”

Section: Resultsmentioning

confidence: 60%

“…Considering the CFA structural phases, the absence of [111] and [002] textures allows us to infer that, except for the sample without the MgO layer, the CFA alloy presents the A2 structure, since the [022] and [422] textures are present, associated with the complete chemical disorder among the Co, Fe and Al sites. 10,13,23 Due the thicknesses of the CFA and Ag layers, no information on the MgO layer is obtained. However, the insertion of this MgO bu®er is responsible for CFA structural orientation, given that the sample produced without the MgO layer presents amorphous structural character.…”

Section: Resultsmentioning

confidence: 99%

“…12 With respect to the magnetic properties of CFA full-Heusler alloy, a complex magnetic behavior has been previously reported. 13 Thus, the exploration of its applicability requires investigations of the magnetization dynamics in saturated and nonsaturated magnetic states of the samples, as well as, in resonant and nonresonant regimes. To this end, the Magnetoimpedance (MI) e®ect presents itself as an interesting tool.…”

Section: Introductionmentioning

confidence: 99%

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CFA Films in Amorphous Substrate: Structural Phase Induction and Magnetization Dynamics

Corrêa

Bohn

Escobar

2017

SPIN

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We report a systematic study of the structural and quasi-static magnetic properties, as well as of the dynamic magnetic response through MI effect, in Co2FeAl and MgO//Co2FeAl single layers and a MgO//Co2FeAl/Ag/Co2FeAl trilayered film, all grown onto an amorphous substrate. We present a new route to induce the crystalline structure in the Co2FeAl alloy and verify that changes in the structural phase of this material leads to remarkable modifications of the magnetic anisotropy and, consequently, dynamic magnetic behavior. Considering the electrical and magnetic properties of the Co2FeAl, our results open new possibilities for technological applications of this full-Heusler alloy in rigid and flexible spintronic devices.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFA Films in Amorphous Substrate: Structural Phase Induction and Magnetization Dynamics

Corrêa

Bohn

Escobar

2017

SPIN

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“…Given all the state above, we took into account a modified Stoner-Wohlfarth model [39,47] to mimic our Co 2 FeAl/W bilayers having induced uniaxial magnetic anisotropy combined with cubic magnetic anisotropy. For the numerical calculations, we considered a system with 50 non-interacting magnetic domains, in which the free energy density for each domain is described by…”

Section: Modeling a System With Uniaxial Magnetic Anisotropy Combinedmentioning

confidence: 99%

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

Lopes

Souza

Santos

et al. 2020

Sensors

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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.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13] The GMI effects have been researched intensively due to the potential application as the highly sensitive magnetic sensor. [1][2][3][4][5][6][7][8][9][10][11][12][13] Since the soft magnetic material usually shows a nonlinear GMI behavior around zero fields and this is inconvenient for magnetic sensor application, hence the asymmetric (and usually hysteretic) GMI effects have been researched to realize auto-biased linear magnetic sensor. For example, researches [14][15][16] applied a bias current to the microwire.…”

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confidence: 99%

Multilevel nonvolatile memory based on the hysteretic giant magnetoimpedance effect of heterogeneous magnetic laminate

Wang

Wen

et al. 2019

Appl. Phys. Express

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This work investigates the asymmetric and hysteretic GMI effect of two-phase heterogeneous magnetic laminate consisting of Ni/Fe30Ni45Co18Si2B5/micro-planar coil/Fe30Ni45Co18Si2B5/Ni for nonvolatile memory application. Since the magnetostrictive Ni ribbon produces the remanent magnetoelastic and magnetostatic fields to the neighboring soft amorphous magnetic alloy (Fe30Ni45Co18Si2B5) when the external dc magnetic field is removed, the proposed laminate manifests multi-level remanent impedances depending on the previously applied magnetic field. And the maximum nonvolatile GMI ratio of 130% is obtained at 400 kHz frequency. Furthermore the laminate can function as multilevel nonvolatile memory, which consumes zero standby power without losing data.

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Giant magnetoimpedance effect in Co2FeAl single layered and Co2FeAl/Ag multilayered films in amorphous substrates

Cited by 11 publications

References 21 publications

CFA Films in Amorphous Substrate: Structural Phase Induction and Magnetization Dynamics

CFA Films in Amorphous Substrate: Structural Phase Induction and Magnetization Dynamics

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

Multilevel nonvolatile memory based on the hysteretic giant magnetoimpedance effect of heterogeneous magnetic laminate

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