Atomic Force Manipulation of Single Magnetic Nanoparticles for Spin-Based Electronics

• 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-two-dimensional 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. © 2022 The Authors. 

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Nanoteknik -- Nanoteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Nano-technology -- Nano-technology (hsv//eng)

Nyckelord

atomic force microscopy

Hall magnetometry

LAO-STO interface

magnetic nanoparticles

nanomanipulation

oxide heterointerfaces

Aluminum compounds

Hysteresis

Hysteresis loops

Lanthanum compounds

Magnetic moments

Magnetic storage

Magnetite

Magnetization

Magnetometry

Nanomagnetics

Nanoparticles

Phase interfaces

Strontium titanates

Two dimensional electron gas

Atomic force

Atomic-force-microscopy

Hall resistance

Hetero-interfaces

Nanomanipulations

Oxide heterointerface

Spin-based electronics

Topdown

Titanium compounds

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