Magnetic structure of periodically meandered one-dimensional Fe nanowires

Abstract

We study the magnetic structure of perpendicularly magnetized Fe nanowires grown on Au͑788͒ by means of x-ray magnetic circular dichroism. The average size of ferromagnetic domains in the nanowires exponentially decreases with temperature, leading to a steeper decay in magnetization compared to nanoislands of Fe. The temperature dependence of magnetization and domain structures can be well described in terms of local atomic geometry, the number of atomic chains in nanowires, exchange coupling between adjacent spins, and magnetic anisotropy. The nonlinear coverage dependence of the activation energy for the creation of magnetic domains can be explained by overall shape of nanowires, which also implies that the magnetic switching processes are strongly shape dependent at the nanoscale.

Spin relaxation signature of colossal magnetic anisotropy in platinum atomic chains

“…Gambardella et al 6 observed both long- and short-range magnetic order in Co chains arranged on a Pt(997) surface, with a blocking temperature of 15 K for the long-range order. In meandered Fe nanowires grown on Au(788), Shiraki et al 9 confirmed the theoretical expectation1011 that the average size of the ferromagnetic domains in the nanowire decreases exponentially with temperature. Strigl et al 1 showed experimentally that even nanowires of platinum, which is paramagnetic in bulk, demonstrate signatures of local magnetic order.…”

Controlling interlayer exchange coupling in one-dimensional Fe/Pt multilayered nanowire

“…31,32 The influence of size and shape of nanowire on magnetic domain pattern in 1D Fe nanowire has also been revealed very recently. 33 In our previous work, the role of Pt spacer in tuning the FM property of Fe/Pt nanowire is addressed. 34 The average magnetic moment per Fe atom is found to increase with the increase in Pt spacer width and has been shown to follow an ϳ1 / N Fe trend; N Fe is the number of Fe layers in the Fe/Pt nanowires.…”

Electronic structure and magnetism of monatomic one‐dimensional metal nanostructures on metal surfaces

“…The focus of the surface science drifts nowadays towards atomic‐scale systems, e.g., wires 1–11, stripes 2, 12–18, clusters 1, 19–25, and nanodots 26–32. Such downscaling requires realistic and efficient ways of description of systems, whose properties are determined by quantum effects and, therefore, are strongly dependent on the environment, dimension, structure, and atomic species involved 33.…”

“…The next interesting aspect of our study is related to creation of low‐dimensional nanostructures on surfaces 33. They could be self‐assembled in a “bottom‐up” manner 1–30, 33–40, or built in a “top‐down” approach by means of the scanning tunneling microscopy (STM) 41–49. The latter technique allows to map surface topography at the atomic scale 50–53 or even with a true atomic resolution 54 and to record simultaneously spectral characteristics of the sample studied 55–57.…”