Magnetic Field Landscapes Guiding the Chemisorption of Diamagnetic Molecules

Abstract

It is shown that the self-assembly of diamagnetic molecule submonolayers on a surface can be influenced by magnetic stray field landscapes emerging from artificially fabricated magnetic domains and domain walls. The directed local chemisorption of diamagnetic subphthalocyaninatoboron molecules in relation to the artificially created domain pattern is proved by a combination of surface analytical methods: ToF-SIMS, X-PEEM, and NEXAFS imaging. Thereby, a new method to influence self-assembly processes and to produce patterned submonolayers is presented.

Magnetic Structure of Ion-Beam Imprinted Stripe Domains Determined by Neutron Scattering

“…Magnetic materials with engineered magnetic textures on micrometer length scales [1][2][3] have attracted attention due to their possible application in lab-on-a-chip devices [4][5][6][7], controlled self-organization [8,9], magnonics [10], controllable optically active surfaces [11] and biosensor applications [12]. One key limitation for lateral magnetic structures is the small feature size, leading to superparamagnetic fluctuations, and the lateral topography, which can limit accessibility by near contact techniques and provide an additional static potential landscape.…”

“…The technique is based on magnetic textures engineered by light-ion irradiation of thin-film exchange bias systems in oriented applied magnetic fields. The three-dimensional stray field landscape emerging from magnetic charges in the topographically flat underlying material provides the ability to guide and manipulate magnetic particles and molecules over distances of several millimeters [6,9,13,[16][17][18].…”

Design of Intense Nanoscale Stray Fields and Gradients at Magnetic Nanorod Interfaces

“…Local magnetic field gradients also find use in surface chemistry for controlling the position of adsorption of diamagnetic molecules. 6 These real-life applications call for an affordable and scalable fabrication process of large area nanomagnetic substrates with tunable stray field configuration and gradient.…”

“…Micro- and nanosized magnets are promising tools for manipulation, , sorting, and detection of biological samples − or for applications in surface chemistry and sensor technologies . A review of recent advances in this broad and emerging research topic can be found in ref .…”

“…The possibility of using nanomagnets with high stray field gradient in a self-assembling process was further elaborated in several studies. − Thus, in ref , the authors investigated the assembly of magnetotactic bacteria and magnetite or cobaltite nanoparticles on micron-sized periodic patterns of commercial audio tapes. Local magnetic field gradients also find use in surface chemistry for controlling the position of adsorption of diamagnetic molecules . These real-life applications call for an affordable and scalable fabrication process of large-area nanomagnetic substrates with tunable stray field configuration and gradient.…”