Anomalous Hall effect in Fe/Au multilayers

Abstract

To understand the interfacial scattering effect on the anomalous Hall effect (AHE), we prepared multilayers of (Fe (36/n) nm /Au (12/n) nm ) n using an e-beam evaporator. This structure design allowed us to investigate the effect of interfacial scattering on the AHE, while keeping the samples' thickness and composition unchanged. We measured the (magneto)transport properties of the samples in a wide temperature range (10-310 K) with magnetic fields up to 50 kOe. We found that the scaling between the anomalous Hall resistivity (ρ AHE ) and longitudinal resistivity (ρ xx ) can be roughly described by ρ AHE ∼ ρ γ xx with γ = 2.65 ± 0.10 and 1.90 ± 0.04 for samples from n = 1 to n = 4 and samples from n = 4 to n = 12, respectively. Our quantitative analysis results showed that the interfacial scattering suppresses the contribution of the intrinsic mechanism and gives rise to a side-jump contribution.

Interfacial scattering effect on anisotropic magnetoresistance and anomalous Hall effect in Ta/Fe multilayers

“…21,22 Theoretical work has been reported that interfacial spin-orbit scattering could induce AMR. 23 In our previous work, 11 interfacial scattering resulted in AMR in Fe/Au multilayers due to the SOC of Au layers. Since the SOC is larger in Ta than that in Au, we then studied how the interfacial scattering affects the magnetoresistance.…”

“…2(j). For comparison, the AMR values of the Fe/Au samples 11 were also plotted. The AMR value is defined as AMR = R (1000 Oe)−R ⊥ (1000 Oe) R ⊥ (1000 Oe) ×100%, where R (1000 Oe)[R ⊥ (1000 Oe)] is the resistivity when magnetic field parallel (perpendicular) to the measurement current at 1000 Oe.…”

“…In our previous study, the interfacial scattering effect plays an important role in the AHE in Fe/Au 11 and Ni/Au 12 multilayers. Since the AHE and AMR both are related to the SOC and Au has relatively smaller SOC comparing to Ta, we then prepared Ta/Fe multilayers which have the same structure with that of Fe/Au multilayers 11 to study the interfacial scattering effect on the AMR and the AHE.…”

“…Experimentally, artificial impurities such as interfacial scattering in granular [8][9][10] and multilayer 11,12 films and surface scattering [13][14][15] have been applied to ferromagnetic materials both for the AHE mechanism exploration and magnetic sensor applications. However, the controversy over the effect of interface/surface scattering on the AHE remains.…”

Anomalous random correlations of force constants on the lattice dynamical properties of disordered Au-Fe alloys

“…Due to the higher magnetic state of Fe in Au-Fe than in pure Fe, various properties have been studied, including thickness dependent spin-glass behavior and anomalous hall conductivity in Fe/Au multilayers. [1][2][3][4][5] Due to its exceptional biocompatibility and favorable physical properties, Au-Fe nanoparticles find various applications in medical sciences, as a promising candidate for cancer cell treatment, multimodal magneto-resonance imaging agent, etc.. [6][7][8][9][10] Gold-rich Au-Fe alloys form a simple face-centeredcubic (fcc) structure. Although fcc is a high-temperature phase, Au-Fe alloys up to 53 at.%Fe are reported to be easily stabilized at room temperature.…”