Atomic Force Manipulation of Single Magnetic Nanoparticles for Spin-Based Electronics
Journal article, 2022

Magnetic nanoparticles (MNPs) are instrumental for fabrication of tailored nanomagnetic structures, especially where top-down lithographic patterning is not feasible. Here, we demonstrate precise and controllable manipulation of individual magnetite MNPs using the tip of an atomic force microscope. We verify our approach by placing a single MNP with a diameter of 50 nm on top of a 100 nm Hall bar fabricated in a quasi -twodimensional electron gas (q2DEG) at the oxide interface between LaAlO3 and SrTiO3 (LAO/STO). A hysteresis loop due to the magnetic hysteresis properties of the magnetite MNPs was observed in the Hall resistance. Further, the effective coercivity of the Hall resistance hysteresis loop could be changed upon field cooling at different angles of the cooling field with respect to the measuring field. The effect is associated with the alignment of the MNP magnetic moment along the easy axis closest to the external field direction across the Verwey transition in magnetite. Our results can facilitate experimental realization of magnetic proximity devices using single MNPs and two-dimensional materials for spin-based nanoelectronics.

oxide heterointerfaces

nanomanipulation

atomic force microscopy

Hall magnetometry

magnetic nanoparticles

LAO-STO interface

Author

Paul Burger

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Gyanendra Singh

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Christer Johansson

Chalmers, Microtechnology and Nanoscience (MC2)

Carlos Moya

Université libre de Bruxelles (ULB)

Gilles Bruylants

Université libre de Bruxelles (ULB)

Gerhard Jakob

Johannes Gutenberg University Mainz

Alexei Kalaboukhov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

ACS Nano

1936-0851 (ISSN) 1936-086X (eISSN)

Vol. 16 11 19253-19260

Areas of Advance

Nanoscience and Nanotechnology

Subject Categories

Nano Technology

Condensed Matter Physics

Infrastructure

Nanofabrication Laboratory

DOI

10.1021/acsnano.2c08622

PubMed

36315462

More information

Latest update

3/7/2024 9