MagnetoCoulomb effects in NPs

Magneto-Coulomb Effect in Carbon Nanotube Quantum Dots Filled with Magnetic Nanoparticles.
S. Datta, L. Marty, J. P. Cleuziou, C. Tilmaciu, B. Soula, E. Flahaut, and W. Wernsdorfer
Phys. Rev. Lett. 107, 186804 (2011)

(a) High resolution TEM of a portion of an individual DWCNT, filled inside its inner shell with elongated nanoparticles.
(b) Schematic representation of the device. (c) Lock-in gate modulation of the device at 40 mK with zero source-drain
bias (Vsd= 0).

TMR modulation in single nanoislands

Spatially Modulated Tunnel Magnetoresistance on the Nanoscale.
Hirofumi Oka, Kun Tao, Sebastian Wedekind, Guillemin Rodary, Valeri S. Stepanyuk, Dirk Sander, and Jü rgen Kirschner
Phys. Rev. Lett. 107, 187201 (2011)

Maps of the TMR ratio obtained at the indicated voltages(e)–(g) Line profiles, averaged over 6
adjacent lines for an improved signal-to-noise ratio, of the TMR ratio images along the yellow arrows in (b)–(d).

Spin wave transport in a domain wall

All-Magnonic Spin-Transfer Torque and Domain Wall Propagation.
P. Yan, X. S. Wang, and X. R. Wang
Phys. Rev. Lett. 107, 177207 (2011)

Illustration of a transverse DW structure whose m is denoted by the (blue) arrows.

Magnetite film crystals

Magnetism in nanometer-thick magnetite.
Matteo Monti, Benito Santos, Arantzazu Mascaraque, Oscar Rodríguez de la Fuente, Miguel Angel Niño,Tevik Onur Mentes¸, Andrea Locatelli, Kevin F. McCarty, José F. Marco, and Juan de la Figuera
Phys. Rev. B 85, 020404(R) (2012)

Selected LEEM images from a sequence acquired during the growth of the magnetite crystals. The first three frames
show the completion of the FeO layer, while the last frame shows the final film with magnetite crystals.

Magnetic Coulomb phase in spin ice

Analysis of a Fully Packed Loop Model Arising in a Magnetic Coulomb Phase.
L. D. C. Jaubert, M. Haque, and R. Moessner
Phys. Rev. Lett. 107, 177202 (2011)

Left: Loops of two colors, blue (red) for up (down) spins, and a worm (dashed green, made of alternating up and down spins), on the checkerboard lattice. Right: Spin ice model on the pyrochlore lattice with in (blue) and out (red) spins.

Molecular Magnets on FM substrates

Coupling Single Molecule Magnets to Ferromagnetic Substrates.
A. Lodi Rizzini, C. Krull, T. Balashov, J. J. Kavich, A. Mugarza, P. S. Miedema, P. K. Thakur, V. Sessi, S. Klyatskaya, M. Ruben, S. Stepanow, and P. Gambardella
Phys. Rev. Lett. 107, 177205 (2011)

Element-resolved hysteresis loops of Ni (top) and Tb (bottom) for (a) TbPc2=Ni=Cuð100Þ,
(b) TbPc2=O=Ni=Cuð100Þ, (c) TbPc2=Li=Ni=Cuð100Þ, and (d) TbPc2=Ni=Agð100Þ measured at normal (left) and grazing
(right) incidence at T ¼ 8 K.

Electric control of magnetism at room T

Electrical control of the ferromagnetic phase transition in cobalt at room temperature.
D. Chiba, S. Fukami, K. Shimamura, N. Ishiwata, K. Kobayashi and T. Ono
Nature Mater. 10, 853 (2011)

Switching of ferromagnetism by electric field at room temperature and measurement configuration. a, Ferromagnetic phase transition of a metal ferromagnet of Cobalt (Co) was induced by applying a gate voltage (VG) at room temperature. The device for the transport measurements consists of a metal gate (Au=Cr), an insulator layer (HfO2), and an ultrathin Co layer. b, Measurement configuration with Hall-bar-shaped device. Anomalous Hall resistance (RHall) measured with a
d.c. current I of 20 A was used to measure the local magnetization of the ultrathin Co layer under the applications of the gate voltage (VG).

Magnetic materials form block copolymers

Room temperature magnetic materials from nanostructured diblock copolymers.
Zoha M. AL-Badri, Raghavendra R. Maddikeri, Yongping Zha, Hitesh D. Thaker, Priyanka Dobriyal, Raja Shunmugam, Thomas P. Russell & Gregory N. Tew
Nature Comms. 2, 1485 (2011)

Magnetic characterization of the BCP and homopolymer. The room temperature response of the thermally annealed (a) BCP and (b) homopolymer to a permanent magnet.

Dynamics of a magnetic dimer

Dynamics of a magnetic dimer with exchange, dipolar, and Dzyalozhinski-Moriya interaction.
A. F. Franco, J. M. Martinez, J. L. Déjardin, and H. Kachkachi
Phys. Rev. B 84, 134423 (2011)

Evolution of the energy potential surface of a DDI-MD with longitudinal anisotropy configuration as ξ increases,
with σ = 1.5.

Disorder in artificial spin ice

Reducing Disorder in Artificial Kagome Ice.
Stephen A. Daunheimer, Olga Petrova, Oleg Tchernyshyov, and John Cumings
Phys. Rev. Lett. 107, 167201 (2011)

LLB model of ultrafast magnetization dynamics

Ultrafast magnetization dynamics rates within the Landau-Lifshitz-Bloch model.
U. Atxitia and O. Chubykalo-Fesenko
Phys. Rev. B 84, 144414 (2011)

Characteristic time scales in ultrafast laser induced magnetization dynamics experiments.

Core/Shell NPs for cancer therapy

A multifunctional core–shell nanoparticle for dendritic cell-based cancer immunotherapy.
Nam-Hyuk Cho, Taek-Chin Cheong, Ji HyunMin, Jun HuaWu, Sang Jin Lee, Daehong Kim, Jae-Seong Yang, Sanguk Kim, Young Keun Kim and Seung-Yong Seong
Nature Nanotechn., 6, 675 (2011)

Characterization of the Fe3O4–ZnO core–shell nanoparticle. a) Core/shell NP and  TEM image. b) Point-probe analysis using TEM equipped with EDX. c) Photographs showing the homogeneous dispersion of nanoparticles. d) Magnetic hysteresis curves.e) Photoluminescence spectrum of the peptide-linked NPs.

Spin ice excitations by μSR

Spin Ice: Magnetic Excitations without Monopole Signatures using μSR.
S. R. Dunsiger,A. A. Aczel, C. Arguello, H. Dabkowska, A. Dabkowski, M.-H. Du, T. Goko, B. Javanparast, T. Lin, F. L. Ning, H. M. L. Noad, D. J. Singh, T. J. Williams, Y. J. Uemura, M. J. P. Gingras, and G. M. Luke
ArXiv 1110.0877 (2011)

Muon spin relaxation rate in Dy2Ti2O7. Individal μSR spectra were analysed using a phenomenological
stretched exponential form commonly used to model glassy systems.

Fast relaxation in NP assemblies

Fast coherent relaxation in a ferromagnet nanoparticle assembly.
V. Henner, Yu. Raikher, and P. Kharebov
Phys. Rev. B 84, 144412 (2011)

Polarization ez (left scale) and feedback field p_H (right scale).

Magnonic modes in satcks of nanoelements

Dispersion of collective magnonic modes in stacks of nanoscale magnetic elements.
M. Dvornik and V. V. Kruglyak
Phys. Rev. B 84, 140405(R) (2011)

The frequencies of the modes of the isolated elements of different sizes are shown as a function of
their ellipticity. In the inset, the mode spectrum of the isolated 100 × 50 × 10 nm3 element is shown.

Quantum spin ice

Quantum Excitations in Quantum Spin Ice.
Kate A. Ross, Lucile Savary, Bruce D. Gaulin, and Leon Balents
Phys. Rev. X 1, 021002 (2011)

Phase diagram for a material in the QSL phase of Eq. (1) at T=H=0. At a low H and T, the QSL state supports exotic excitations: ‘‘magnetic’’ (red sphere) and‘‘electric’’ (yellow sphere) monopoles, and an emergent photon
(wavy line). The field Hc marks a quantum critical point: the confinement phase transition. For H>Hc, the ground state is a simple field-polarized ferromagnet (FM), and the elementary excitations are conventional magnetic dipoles.

Spinning on Ice.
Rajiv R. P. Singh
Physics 4.77 story

a) Spin configurations on a tetrahedra that obey the “ice-rules.” (b) Proposed low-temperature phases of a quantumspin ice consist of a magnetically polarized high-field phase with usual spin-flip excitations (shown at right) and
a low-field phase consisting of “emergent” dynamical photons (shown by a wavy line) and electric and magnetic charges
(shown schematically as plus and minus charges with emanating electric fields and north (N) and south (S) poles with
emanating magnetic fields).

Inertial effects in magnetization dynamics

Magnetization Dynamics, Gyromagnetic Relation, and Inertial Effects.
J.-E. Wegrowe; M.-C. Ciornei
Am. J. Phys. 80 (6) (2012)

Image recovery using nanomagnets

An ultrafast image recovery and recognition system implemented with nanomagnets possessing biaxial magnetocrystalline anisotropy.
Noel D'Souza, Jayasimha Atulasimha, and Supriyo Bandyopadhyay
ArXiv 1109.6932 (2011)

Recovering an image corrupted by noise by encoding in different magnetic states.