Scaling of the anomalous Hall current in Fe100−x(SiO2)

Wenjin Xu

¹

,

Bei Zhang

²

,

Qingxiao Wang

³

et al.

Abstract

To study the origin of the anomalous Hall effect, Fe 100−x (SiO 2 ) x granular films with a volume fraction of SiO 2 (0 x 40.51) were fabricated using cosputtering. Hall and longitudinal resistivities were measured in the temperature range of 5-350 K with magnetic fields up to 5 T. As x increased from 0 to 40.51, the anomalous Hall resistivity and longitudinal resistivity increased by about four and three orders in magnitude, respectively. Analysis of the results revealed that the normalized anomalous Hall conductivity is a constant for all of the samples, which may suggest a scattering-independent anomalous Hall conductivity in Fe.

Anomalous Hall effect in Fe/Au multilayers

“…This means that the AHE is directly related to the density and strength of the scattering from the interfaces and grain boundaries. In inhomogeneous systems, like granular thin films, both the composition and the particle size of the nonmagnetic material doped in the samples affect the AHE, which explains why various scaling relations have been reported for very similar granular thin films, e.g., Fe-SiO 2 films, by different groups [5,25,26]. In the present work, the influence of composition variation was avoided in the scaling relation and only the amount of interfacial scattering differs between the different samples.…”

“…To this end, interfacial scattering in granular [5,6] and multilayer [7,8] systems and surface scattering [9][10][11] have been used to tune the longitudinal and anomalous Hall resistivity, experimentally. However, considering the side jump, the commonly used scaling law ρ AHE ∼ ρ γ xx is valid only for relatively homogeneous bulklike systems and invalid when the layer * Corresponding author: pengy@lzu.edu.cn † Corresponding author: xixiang.zhang@kaust.edu.sa thickness is of the order of or smaller than the mean free path (MFP) in multilayers [12].…”

Anomalous Hall effect in Co40Fe40B20/SiO2/Si structures

“…Ferromagnetic metals and alloys were mostly used for the research [2][3][4]. Magnetic granular films exhibit giant Hall resistivity [5]. The contributions of surface and interface scattering on AHE were also verified in ferromagnetic/nonmagnetic (FM/NM) multilayers, such as [Co/Pd] n , [Co/Cu] n and [Co/Pt] n [6][7][8].…”

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

“…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.…”

“…In granular thin films, interfacial scattering has been proved to dominate the AHE in Co-MgO system 10 but scatteringindependent AHE has been reported in Fe-SiO 2 system. 9 In multilayer systems, both surface scattering dominated AHE 16 and interfacial scattering dominated AHE [17][18][19][20] which remains elusive. Furthermore, the interfacial scattering could also lead to other physical phenomenon such as giant magnetoresistance (GMR), 21,22 anisotropic magnetoresistance (AMR), 23 etc.…”