@article{13341,
  abstract     = {Scanning nanoscale superconducting quantum interference devices (nanoSQUIDs)
are of growing interest for highly sensitive quantitative imaging of magnetic,
spintronic, and transport properties of low-dimensional systems. Utilizing
specifically designed grooved quartz capillaries pulled into a sharp pipette,
we have fabricated the smallest SQUID-on-tip (SOT) devices with effective
diameters down to 39 nm. Integration of a resistive shunt in close proximity to
the pipette apex combined with self-aligned deposition of In and Sn, have
resulted in SOT with a flux noise of 42 n$\Phi_0$Hz$^{-1/2}$, yielding a record
low spin noise of 0.29 $\mu_B$Hz$^{-1/2}$. In addition, the new SOTs function
at sub-Kelvin temperatures and in high magnetic fields of over 2.5 T.
Integrating the SOTs into a scanning probe microscope allowed us to image the
stray field of a single Fe$_3$O$_4$ nanocube at 300 mK. Our results show that
the easy magnetization axis direction undergoes a transition from the (111)
direction at room temperature to an in-plane orientation, which could be
attributed to the Verwey phase transition in Fe$_3$O$_4$.},
  author       = {Anahory, Y. and Naren, H. R. and Lachman, E. O. and Sinai, S. Buhbut and Uri, A. and Embon, L. and Yaakobi, E. and Myasoedov, Y. and Huber, M. E. and Klajn, Rafal and Zeldov, E.},
  issn         = {2040-3372},
  journal      = {Nanoscale},
  number       = {5},
  pages        = {3174--3182},
  publisher    = {Royal Society of Chemistry},
  title        = {{SQUID-on-tip with single-electron spin sensitivity for high-field and ultra-low temperature nanomagnetic imaging}},
  doi          = {10.1039/C9NR08578E},
  volume       = {12},
  year         = {2020},
}

@article{13368,
  abstract     = {Scanning nanoscale superconducting quantum interference devices (nanoSQUIDs) are of growing interest for highly sensitive quantitative imaging of magnetic, spintronic, and transport properties of low-dimensional systems. Utilizing specifically designed grooved quartz capillaries pulled into a sharp pipette, we have fabricated the smallest SQUID-on-tip (SOT) devices with effective diameters down to 39 nm. Integration of a resistive shunt in close proximity to the pipette apex combined with self-aligned deposition of In and Sn, has resulted in SOTs with a flux noise of 42 nΦ0 Hz−1/2, yielding a record low spin noise of 0.29 μB Hz−1/2. In addition, the new SOTs function at sub-Kelvin temperatures and in high magnetic fields of over 2.5 T. Integrating the SOTs into a scanning probe microscope allowed us to image the stray field of a single Fe3O4 nanocube at 300 mK. Our results show that the easy magnetization axis direction undergoes a transition from the 〈111〉 direction at room temperature to an in-plane orientation, which could be attributed to the Verwey phase transition in Fe3O4.},
  author       = {Anahory, Y. and Naren, H. R. and Lachman, E. O. and Buhbut Sinai, S. and Uri, A. and Embon, L. and Yaakobi, E. and Myasoedov, Y. and Huber, M. E. and Klajn, Rafal and Zeldov, E.},
  issn         = {2040-3372},
  journal      = {Nanoscale},
  keywords     = {General Materials Science},
  number       = {5},
  pages        = {3174--3182},
  publisher    = {Royal Society of Chemistry},
  title        = {{SQUID-on-tip with single-electron spin sensitivity for high-field and ultra-low temperature nanomagnetic imaging}},
  doi          = {10.1039/c9nr08578e},
  volume       = {12},
  year         = {2020},
}

@article{13385,
  abstract     = {Novel light-responsive nanoparticles were synthesized by decorating the surfaces of gold and silver nanoparticles with a nitrospiropyran molecular photoswitch. Upon exposure to UV light in nonpolar solvents, these nanoparticles self-assembled to afford spherical aggregates, which disassembled rapidly when the UV stimulus was turned off. The sizes of these aggregates depended on the nanoparticle concentration, and their lifetimes could be controlled by adjusting the surface concentration of nitrospiropyran on the nanoparticles. The conformational flexibility of nitrospiropyran, which was altered by modifying the structure of the background ligand, had a profound impact on the self-assembly process. By coating the nanoparticles with a spiropyran lacking the nitro group, a conceptually different self-assembly system, relying on a reversible proton transfer, was realized. The resulting particles spontaneously (in the dark) assembled into aggregates that could be readily disassembled upon exposure to blue light.},
  author       = {Kundu, Pintu K. and Das, Sanjib and Ahrens, Johannes and Klajn, Rafal},
  issn         = {2040-3372},
  journal      = {Nanoscale},
  keywords     = {General Materials Science},
  number       = {46},
  pages        = {19280--19286},
  publisher    = {Royal Society of Chemistry},
  title        = {{Controlling the lifetimes of dynamic nanoparticle aggregates by spiropyran functionalization}},
  doi          = {10.1039/c6nr05959g},
  volume       = {8},
  year         = {2016},
}