Paul Scherrer Institut

Laura Heyderman

Hans-Benjamin Braun

Elena Mengotti

Thomas A Jung

Rajesh Chopdekar

Danilo Zanin

Gerard Duff

Ernst Meyer

Thomas Schrefl

Bettina Baumeister

Remo Hügli

André Bisig

Arantxa Fraile Rodríguez

Frithjof Nolting

Remo Huegli

Christoph Walter

A method is provided for achieving specific magnetic states with a given vortex chirality in artificial kagome spin ice building block structures containing one or more hexagonal rings of ferromagnetic islands created with electron beam lithography, where a subgroup of the ferromagnetic islands have a smaller width and therefore higher switching field than the other normal (wider) islands and are placed at specific positions in each of the rings. The positioning of the islands determines the magnetic state of the building block structure during magnetization reversal, and determines the chirality of the magnetic vortices that occur in each ring.

Method of controlling the states and vortex chirality in hexagonal ring structures comprising nanoscale magnetic elements

A method is provided for achieving low energy states for the study of chirality kagome spin ice structures, the method having the steps of providing a silicon substrate; spin coating a polymethyl acrylate resist on said silicon substrate; providing an electron beam writer; exposing said coated substrate to an electron beam from said electron beam writer; positioning more than one thin island ferromagnetic island structure along a honeycomb lattice of said kagome spin ice component, wherein said positioning being along a determined magnetization direction of said lattice and wherein said island structures providing a mechanism in which chirality is controlled.

Method of studying chirality controlled artificial kagome spin ice building blocks

A method and a system for coding and reading out information in a microscopic cluster formed with coupled functional islands includes: generating the cluster by forming a regular microscopic pattern for locating the functional islands; making use of a physical or chemical property of each individual island and making use of the coupling between the functional islands; assigning different information to different energy levels of the cluster; effecting a change of the physical or chemical property of at least one functional island in order to change the energy level of the cluster to the energy level equivalent to the information content to be coded; and reading out the information. These measures allow forming a cluster having distinct energy levels, each being assigned to a distinct information content. These systems pave the way for future devices based on clusters of coupled islands and, armed with the complete knowledge of the energy states, the door is opened for use of these finite multistate clustered structures in future spintronic devices, for example for data storage, memory applications or to perform logic operations.

Method and system for coding and read out of information in a microscopic cluster comprising coupled functional islands

The invention is essentially characterized in that in a first step a substrate is provided, which is coated with defined pattern of protrusions of a coating layer of a different material, so that an interface is defined between the substrate and the coating layer. As an example, the patterned coating layer can be applied by first forming an essentially homogeneous coating layer, which is then partially removed by means of photolithographic and etching techniques, leaving nanometer sized protrusions in that layer. As a next step, the surface provided with these structures is modified by selectively removing protrusions by means of a micro-device. Such a micro-device can be formed in a similar way to a scanning probe microscope (SPM) tip. The presence or absence of a protrusion represents a readable data bit information.

Memory element, method for structuring a surface, and storage device

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Zofingen, Switzerland

Laura Heyderman