Three-Axis Vector Nano Superconducting Quantum Interference Device

Abstract

We present the design, realization, and performance of a three-axis vector nano superconducting quantum interference device (nanoSQUID). It consists of three mutually orthogonal SQUID nanoloops that allow distinguishing the three components of the vector magnetic moment of individual nanoparticles placed at a specific position. The device is based on Nb/HfTi/Nb Josephson junctions and exhibits line widths of ∼250 nm and inner loop areas of 600 × 90 and 500 × 500 nm(2). Operation at temperature T = 4.2 K under external magnetic fields perpendicular to the substrate plane up to ∼50 mT is demonstrated. The experimental flux noise below [Formula: see text] in the white noise limit and the reduced dimensions lead to a total calculated spin sensitivity of [Formula: see text] and [Formula: see text] for the in-plane and out-of-plane components of the vector magnetic moment, respectively. The potential of the device for studying three-dimensional properties of individual nanomagnets is discussed.

Efficient and tunable Aharonov-Bohm quantum heat engine

“…Yet, the AB interferometer represents the archetypal quantum platform in mesoscopic physics which has been largely investigated arXiv:1905.12672v1 [cond-mat.mes-hall] 29 May 2019 so far both from the theoretical [31][32][33][34][35] and experimental [36][37][38][39] side since it can be easily realized with current state-of-the-art nano-fabrication techniques and available materials. In light of the above considerations, the AB engine has the potential to pave the avenue to the realization of a novel class of phase-tunable quantum machines ranging from thermal rectifiers [24,[40][41][42][43][44][45] and autonomous heat engines [46][47][48][49] to driven Floquet heat engines [50][51][52][53][54][55].…”

Sample Preparation for Inorganic Trace Element Analysis

“…By combining three mutually orthogonal nanoSQUID loops, a 3-axis vector magnetometer has been realized very recently 68 . Here, the idea is to distinguish the three components of the vector magnetic moment µ of a MNP placed at a specific position, and subjected to an applied magnetic field along z-direction for magnetization reversal measurements.…”

Investigation of Dayem Bridge NanoSQUIDs Made by Xe Focused Ion Beam

“…S UPERCONDUCTING QUantum Interference Devices (SQUIDs) are macroscopic quantum devices that are capable of detecting and measuring a wide range of physical parameters with unequalled sensitivity [1], [2]. In addition to conventional trilayer SQUIDs whose performance has shown rapid improvements recently [3], [4], SQUIDs based on nanobridge Josephson junctions (also known as Dayem bridges) have returned to popularity in recent years, with the realization that their low capacitance and high critical current density can provide advantages of low intrinsic noise and potentially high-frequency operation [5]- [8]. In addition, their small scale in all three dimensions makes them particularly suitable for nanoSQUIDs [9]- [14].…”