TY  - JOUR
A1  - Al Mamoori, Mohanad K. I.
A1  - Keller, Lukas
A1  - Pieper, Jonathan
A1  - Barth, Sven
A1  - Winkler, Robert
A1  - Plank, Harald
A1  - Müller, Jens
A1  - Huth, Michael
T1  - Magnetic characterization of direct-write free-form building blocks for artificial magnetic 3D lattices
T2  - Materials
N2  - Three-dimensional (3D) nanomagnetism, where spin configurations extend into the vertical direction of a substrate plane allow for more complex, hierarchical systems and the design of novel magnetic effects. As an important step towards this goal, we have recently demonstrated the direct-write fabrication of freestanding ferromagnetic 3D nano-architectures of ferromagnetic CoFe in shapes of nano-tree and nano-cube structures by means of focused electron beam induced deposition. Here, we present a comprehensive characterization of the magnetic properties of these structures by local stray-field measurements using a high-resolution micro-Hall magnetometer. Measurements in a wide range of temperatures and different angles of the externally applied magnetic field with respect to the surface plane of the sensor are supported by corresponding micromagnetic simulations, which explain the overall switching behavior of in part rather complex magnetization configurations remarkably well. In particular, the simulations yield coercive and switching fields that are in good quantitative correspondence with the measured coercive and switching fields assuming a bulk metal content of 100 at % consisting of bcc Co 3 Fe. We show that thermally-unstable magnetization states can be repetitively prepared and their lifetime controlled at will, a prerequisite to realizing dynamic and thermally-active magnetic configurations if the building blocks are to be used in lattice structures.
KW  - focused electron beam induced deposition
KW  - micro-Hall magnetometry
KW  - magnetic nanostructures
KW  - micromagnetic simulations
KW  - artificial magnetic lattices
Y1  - 2018
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/51472
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-514721
SN  - 1996-1944
N1  - This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
VL  - 11
IS  - 2, Art. 289
SP  - 1
EP  - 16
PB  - MDPI
CY  - Basel
ER  -