| 1. |
- Burger, Paul, 1997, et al.
(författare)
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Atomic Force Manipulation of Single Magnetic Nanoparticles for Spin-Based Electronics
- 2022
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Ingår i: ACS Nano. - : American Chemical Society. - 1936-0851 .- 1936-086X. ; 16:11, s. 19253-19260
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Kolvik, Johan, 1995, et al.
(författare)
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Clamped and sideband-resolved silicon optomechanical crystals
- 2023
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Ingår i: Optica. - 2334-2536. ; 10:7, s. 913-916
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Tidskriftsartikel (refereegranskat)abstract
- Optomechanical crystals (OMCs) are a promising and versatile platform for transduction between mechanical and optical fields. However, the release from the substrate used in conventional suspended OMCs also complicates manufacturing and severely reduces thermal anchoring. This may be improved by attaching the OMCs directly to the substrate. Previous work towards such clamped, i.e., non-suspended, OMCs suffers from weak interaction rates and insufficient lifetimes. Here, we present a class of clamped OMCs realizing—for the first time, to our knowledge—optomechanical interactions in the resolved-sideband regime required for quantum transduction. Our approach leverages high-wavevector mechanical modes outside the continuum. We observe a record zero-point optomechanical coupling rate of g0/(2π) ≈ 0.50 MHz along with a sevenfold improvement in the single-photon cooperativity of clamped OMCs. Our devices operate at frequencies commonly used in superconducting qubits. This opens an avenue using clamped OMCs in both classical and quantum communications, sensing, and computation through scalable mechanical circuitry that couples strongly to light.
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