Molecules at the Quantum–Classical Nanoparticle Interface

Molecules at the Quantum–Classical Nanoparticle Interface: Giant Mn70 Single-Molecule Magnets of ∼4 nm Diameter.

Alina Vinslava, Anastasios J. Tasiopoulos, Wolfgang Wernsdorfer, Khalil A. Abboud, and George Christou

Inorganic Chemistry 55, 3419 (2016)

 

Thermally activated helicity reversals of skyrmions

Thermally activated helicity reversals of skyrmions.
X. Z. Yu, K. Shibata, W. Koshibae, Y. Tokunaga, Y. Kaneko, T. Nagai, K. Kimoto, Y. Taguchi, N. Nagaosa, and Y. Tokura
Phys. Rev. B 93, 134417 (2016)

Schematic of a bubble with winding number 1. Arrows show that the magnetic moments and concentric rings are a bubble domain wall. ϕ, φ, and ψ denote the polar angle, azimuthal angle, and the angle between the magnetic moment and the $x$ direction, respectively.

Geometrical Effects on the Magnetic Properties of NP

Geometrical Effects on the Magnetic Properties of  Nanoparticles.
Cono Di Paol, Roberto D’Agosta, and Francesca Baletto
Nano Letters 16, 2885 (2016)

Individual Magnetic NP by Optical Tweezers

Characterization of Individual Magnetic Nanoparticles in Solution by Double Nanohole Optical Tweezers.
Haitian Xu, Steven Jones, Byoung-Chul Choi, and Reuven Gordon 
Nano Letteters 16, 2639 (2016)

DW motion in Ring Nanowire

Fast Magnetic Domain-Wall Motion in a Ring-Shaped Nanowire Driven by a Voltage.

Jia-Mian Hu, Tiannan Yang, Kasra Momeni, Xiaoxing Cheng, Lei Chen, Shiming Lei, Shujun Zhang, Susan Trolier-McKinstry, Venkatraman Gopalan, Gregory P. Carman, Ce-Wen Nan, and Long-Qing Chen 
Nano Lett. 16, 2341 (2016)

Magnetic remanence in single atoms

Magnetic remanence in single atoms.

F. Donati, S. Rusponi, S. Stepanow, C. Wäckerlin, A. Singha, L. Persichetti, R. Baltic, K. Diller, F. Patthey, E. Fernandes, J. Dreiser, Ž. Šljivančanin, K. Kummer, C. Nistor, P. Gambardella, H. Brune

Science 352, 318 (2016)

Chirality-Dependent Transmission of SW through DW

Chirality-Dependent Transmission of Spin Waves through Domain Walls.
F. J. Buijnsters, Y. Ferreiros, A. Fasolino, and M. I. Katsnelson
Phys. Rev. Lett. 116, 147204 (2016)

Effect of the interfacial DMI on the magnetization profile $m\left(x\right)$ of a DW in a thin film with perpendicular anisotropy. (a) Away from the DW, magnetization points out of the film ($\hat{z}$ or $-\hat{z}$). Near the DW, the DMI creates an effective field $H_{\mathrm{DMI}}$ in the $-\hat{x}$ direction. Depending on the competition between the dipolar and DMI interactions, the equilibrium configurations circle, circle prime, star, star prime, and square, shown in (b)–(d), are possible. (b) Without DMI, the minimum-energy configurations (flux closure) are two equivalent Bloch DWs (circle, in dark colors, and circle prime, in light colors), whose in-plane orientations differ by 180°. (c) For intermediate DMI, the minimum-energy configurations are intermediate between Bloch and Néel. There are two equivalent minimum-energy states (star and star prime), whose in-plane orientations differ by approximately 90° for an appropriately tuned DMI strength $D$. (d) For strong DMI, a single minimum-energy configuration (square) exists: a Néel DW with magnetization in the center pointing in the $-\hat{x}$ direction.

Antiferromagnetic Skyrmions: Applied Current and Temperature

Static and Dynamical Properties of Antiferromagnetic Skyrmions in the Presence of Applied Current and Temperature.
Joseph Barker and Oleg A. Tretiakov
Phys. Rev. Lett. 116, 147203 (2016)

The spin texture of a $G$-type AFM Skyrmion. (a) Top view of the Skyrmion, white lines show contours of constant $n_z$. The radius is 2.1 nm. (b) Cross section of the Skyrmion. The core is not a single spin but a compensated structure combining the two sublattices.

EB by field-induced spin reconfiguration in Ni-Mn-Sn

Exchange bias caused by field-induced spin reconfiguration in Ni-Mn-Sn.
A. Çakır, M. Acet, and M. Farle
Phys. Rev. B 93, 094411 (2016)

$M-H$ curves for $x=10.1$ between 10 and 70 K. Open and closed symbols represent FC and ZFC measurements, respectively.

Generation of magnetic skyrmion bubbles

Generation of magnetic skyrmion bubbles by inhomogeneous spin Hall currents.
Olle Heinonen, Wanjun Jiang, Hamoud Somaily, Suzanne G. E. te Velthuis, and Axel Hoffmann
Phys. Rev. B 93, 094407 (2016)

The left panel shows a contour plot of the out-of-plane component of the magnetization director of a skyrmion bubble. The right panel shows the out-of-plane component of the magnetization across the line indicated in the left panel. The domain-wall width estimated from $m_z=0.9$ to $m_z=-0.9$ is about 30 nm.

Antiferromagnetic textures

Intrinsic magnetization of antiferromagnetic textures
Erlend G. Tveten, Tristan Müller, Jacob Linder, and Arne Brataas
Phys. Rev. B 93, 104408 (2016)

Sketch of the intrinsic magnetization $m\left(z\right)$ (red) (not to scale) of one-dimensional (a) Néel and (b) Bloch (not used in the calculations) domain walls in the order parameter $n\left(z\right)$ (green). The equilibrium magnetization profile was calculated from Eq. (14). We note that the magnetization is so small that in a one-dimensional system, the domain-wall spin must be treated quantum mechanically. However, for higher-dimensional extended systems, the total spin of domain walls could be of appreciable size because the intrinsic magnetization is additive in the perpendicular directions.

Duality of Iron Oxide Nanoparticles in Cancer Therapy: Amplification of Heating Efficiency by Magnetic Hyperthermia and Photothermal Bimodal Treatment - ACS Nano (ACS Publications)

Duality of Iron Oxide Nanoparticles in Cancer Therapy: Amplification of Heating Efficiency by Magnetic Hyperthermia and Photothermal Bimodal Treatment.
Ana Espinosa, Riccardo Di Corato, Jelena Kolosnjaj-Tabi, Patrice Flaud, Teresa Pellegrino, and Claire Wilhelm
ACS Nano 10 2436 (2016)