Non-Planar Geometrical Effects on the Magnetoelectrical Signal in a Three-Dimensional Nanomagnetic Circuit

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Three-dimensional (3D) nanomagnetism and spintronics present advanced opportunities but face challenges in studying complex geometries.
• Magnetoelectrical phenomena in 3D nanodevices require sophisticated investigation due to vectorial current and magnetization.

Purpose of the Study:

• To investigate the magnetoelectrical signals in a ferromagnetic 3D nanodevice integrated into a microelectronic circuit.
• To disentangle the superposition of magnetoelectrical effects arising from 3D geometry and vectorial fields.
• To understand the influence of noncollinear demagnetizing fields on magnetotransport phenomena.

Main Methods:

• Direct-write nanofabrication of a 3D ferromagnetic nanodevice.
• Electrical measurements under applied 3D magnetic fields.
• Macrospin simulations and finite element modeling for data analysis.

Main Results:

• Unusual angular dependencies of magnetotransport effects, like the anomalous Hall effect, were observed due to 3D geometry.
• Noncollinear demagnetizing fields in 3D nanostructures were identified as a significant factor.
• Angular-dependent magnon magnetoresistance was found to contribute substantially to the overall magnetoelectrical signal.

Conclusions:

• The study elucidates the complex magnetoelectrical behavior in 3D spintronic nanodevices.
• Findings highlight the critical role of intrinsic noncollinear demagnetizing fields in 3D nanostructures.
• Results provide foundational understanding for advancing 3D spintronic systems and devices.