Anomalous Hall effect in ion-beam sputtered Co2FeAl full Heusler alloy thin films

The Structural, Magnetic, and Transport Properties of the Pulsed Laser‐Deposited Co2FeAl Thin Films

“…This phenomenon has been observed in many Heusler alloys films prepared by magnetron sputtering or molecular beam epitaxy, such as Co 2 MnSi and Co 2 TiGe. [28,29] Recently, Sajid et al also observed similar behavior in ion-beam-sputtered CFA full Heusler alloy thin films [30] ; however, it is not observed in magnetron-sputtered CFA films. [19] Generally, this type of low-temperature anomaly was attributed to the weak localization effect.…”

“…[31] To understand the scattering mechanism of conduction electrons in our PLD-grown CFA thin films, the ρ xx in the lowtemperature range was systematically analyzed. Considering the possible contributions of various scattering mechanisms in the low-temperature conditions, the ρ xx can be expressed as [30]…”

“…Overall, the value b is higher than that reported for ion-beam-sputtered B2-ordered CFA films, but lower than that of B2-ordered CFA films grown by molecular beam epitaxy. [22,30] The reasons could be due to the different deposition processes, bringing the various degrees of structure ordering.…”

Atomic disorder and Berry phase driven anomalous Hall effect in Co2FeAl Heusler compound

“…Among Co 2based Heusler compounds, Co 2 FeAl is the most prominent candidate for the data processing and storage based applications due to its large Curie temperature(∼ 810 K to 900 K), high spin-polarization, low gilbert damping factor, and ultrafast magnetization dynamics [30][31][32][33]. As literature suggest that the Co 2 FeAl is generally crystallizes in B2-type [31,[34][35][36] disordered structure, therefore, this compound provides an opportunity for the investigation of the disorder effect on the Berry curvature and intrinsic AHC. Attempts to investigate anomalous transport in Co 2 FeAl thin films report controversial result concerning to the origin of AHE [34,35,37].…”

“…As literature suggest that the Co 2 FeAl is generally crystallizes in B2-type [31,[34][35][36] disordered structure, therefore, this compound provides an opportunity for the investigation of the disorder effect on the Berry curvature and intrinsic AHC. Attempts to investigate anomalous transport in Co 2 FeAl thin films report controversial result concerning to the origin of AHE [34,35,37].…”