Long-Range Domain Wall Tension in Pt/Co/Pt Films with Perpendicular Magnetic Anisotropy

Abstract

We report an experimental detection of a long-range tension effect on magnetic domain walls in Pt/Co/Pt films. Such a tension effect is observed from circular domains expanding (or shrinking) under a constant applied magnetic field. Interestingly, the domain propagation speed varies with respect to the domain radius. Converting the speed variation to a magnetic field via the creep scaling, it is revealed that there exists an effective field inversely proportional to the radius, in accordance with the domain wall tension and the magnetostatic dipolar interaction. The sizeable tension effect subsists over 20 m, providing a way to directly determine the wall energy density. #

Nonequilibrium Cluster Diffusion During Growth and Evaporation in Two Dimensions

“…Furthermore, our work suggests the measurement of the MSD as a simpler way to determine the universality class, while previous studies relied on the spatiotemporal analysis of edge fluctuations, involving refined tracking of the moving edge. We thus hope that our results will motivate experiments to measure the MSD of clusters in a wide range of experimental systems, from magnetic domains to cell colonies [1][2][3][4][5][6][7][8].…”

“…Two-dimensional clusters with fluctuating edges (sometimes called droplets, islands, or aggregates) have been observed in many different systems such as monolayer islands on crystal surfaces [1,2]; domains in magnetic thin films [3,4]; droplets in turbulent liquid crystal films [5]; or bacteria, cell, and fungi colonies [6][7][8]. Many theoretical studies of two-dimensional clusters have focused on the analysis of edge fluctuations and their classification into roughening universality classes in equilibrium and nonequilibrium conditions [9][10][11][12].…”

Magnetic bubblecade memory based on chiral domain walls

“…Because of the rotational symmetry with respect to the center of the bubble, the present bubble expands or shrinks circularly under an out-of-plane magnetic field H z (Ref. 10 ). However, if one applies an in-plane magnetic field H x , becomes tilted to the direction of H x due to the Zeeman interaction as illustrated by the arrows in Fig.…”

“…Such DW motion, however, requires a high threshold current, which is inevitably accompanied by high Joule heating 9 that may cause severe artifacts. Structural modulation of the nanowires has therefore been proposed to reduce the threshold current by introducing DW tension 10 . With wedge-shaped modulation, the DW tension exerts a force on the DWs to reduce the tension energy and consequently, facilitates the DW motion toward the apex edge 11 .…”

A spin torque meter with magnetic facet domains

“…5a–c ). Small value of H z and H ST make a blunt vertex because the influence of the DW tension 49 is relatively large at the facet vertex. If we apply H SOT and H SMT simultaneously, we can see an offset of tilting because the adiabatic SMT tilts the DW magnetization that changes the SOT field at each side of the facet (Fig.…”