Nanocavity-Mediated Fast Magnetic Vortex Core In-Situ Switching by Local Magnetic Field

2021 ◽  
Vol 38 (12) ◽  
pp. 127501
Author(s):  
Xiao-Ping Ma ◽  
Hongguo Yang ◽  
Changfeng Li ◽  
Cheng Song ◽  
Hong-Guang Piao
Keyword(s):  
Magnetic Field ◽  
Vortex Core ◽  
Switching Time ◽  
Magnetic Vortex ◽  
Local Magnetic Field ◽  
Fast Switching ◽  
Low Field ◽  
Perpendicular Field ◽  
Data Reading

Fast in situ switching of magnetic vortex core in a ferromagnetic nanodisk assisted by a nanocavity, with diameter comparable to the dimension of a vortex core, is systematically investigated by changing the strength as well as the diameter of the effective circular region of the applied magnetic field. By applying a local magnetic field within a small area at the nanodisk center, fast switching time of about 35 ps is achieved with relatively low field strength (70 mT) which is beneficial for fast data reading and writing. The reason for this phenomenon is that the magnetic spins around the nanocavity is aligned along the cavity wall due to the shape anisotropy when the perpendicular field is applied, which deepens the dip around the vortex core, and thus facilitates the vortex core switching.

scholarly journals Duffing oscillation-induced reversal of magnetic vortex core by a resonant perpendicular magnetic field

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Kyoung-Woong Moon ◽  
Byong Sun Chun ◽  
Wondong Kim ◽  
Z. Q. Qiu ◽  
Chanyong Hwang
Keyword(s):  
Magnetic Field ◽  
Vortex Core ◽  
Magnetic Vortex ◽  
Perpendicular Magnetic Field

Dynamics of magnetic vortex core switching in Fe nanodisks by applying in-plane magnetic field pulse

2007 ◽  
Vol 102 (10) ◽  
pp. 103904 ◽  
Author(s):  
Q. F. Xiao ◽  
J. Rudge ◽  
E. Girgis ◽  
J. Kolthammer ◽  
B. C. Choi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Vortex Core ◽  
Magnetic Vortex ◽  
Magnetic Field Pulse ◽  
Field Pulse

scholarly journals Shifting and Pinning of a Magnetic Vortex Core in a Permalloy Dot by a Magnetic Field

2005 ◽  
Vol 95 (23) ◽  
Author(s):  
Thomas Uhlig ◽  
M. Rahm ◽  
Christian Dietrich ◽  
Rainer Höllinger ◽  
Martin Heumann ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Vortex Core ◽  
Magnetic Vortex

LOW-FIELD MAGNETORESISTANCE ANISOTROPY IN STRAINED ULTRATHIN Pr0.67Sr0.33MnO3 FILMS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3827-3829
Author(s):  
H. S. Wang ◽  
Qi Li
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Tensile Strain ◽  
Perpendicular Magnetic Field ◽  
Low Field ◽  
Parallel Field ◽  
Induced Magnetic Anisotropy ◽  
Perpendicular Field ◽  
Strained Films

We have studied the anisotropic low-field magnetoresistance (LFMR)in ultrathin Pr 0.67 Sr 0.33 MnO 3(PSMO) films epitaxially grown on LaAlO 3(LAO), STiO 3(STO), and NdGaO 3(NGO)substrates which impose compressive, tensile, and nearly-zero strains in the films. The compressively-strained films show a very large negative LFMR in a perpendicular magnetic field and a much smaller MR in a parallel field, while the tensile-strain films show positive LFMR in a perpendicular field and negative MR in a parallel field. The results are interpreted based on the strain-induced magnetic anisotropy.

scholarly journals Reversal process of a magnetic vortex core under the combined action of a perpendicular field and spin transfer torque

2013 ◽  
Vol 102 (6) ◽  
pp. 062401 ◽  
Author(s):  
N. Locatelli ◽  
A. E. Ekomasov ◽  
A. V. Khvalkovskiy ◽  
Sh. A. Azamatov ◽  
K. A. Zvezdin ◽  
...  
Keyword(s):  
Vortex Core ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetic Vortex ◽  
Reversal Process ◽  
Combined Action ◽  
Perpendicular Field

scholarly journals Small-scale Magnetic Flux Ropes with Field-aligned Flows via the PSP In-situ Observations

2021 ◽  
Author(s):  
Yu Chen ◽  
Qiang Hu ◽  
Lingling Zhao
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Rope ◽  
Local Magnetic Field ◽  
Small Scale ◽  
Magnetic Flux Rope ◽  
Magnetic Flux Ropes ◽  
Flux Ropes ◽  
Field Lines

<p>Magnetic flux rope, formed by the helical magnetic field lines, can sometimes remain its shape while carrying significant plasma flow that is aligned with the local magnetic field. We report the existence of such structures and static flux ropes by applying the Grad-Shafranov-based algorithm to the Parker Solar Probe (PSP) in-situ measurements in the first five encounters. These structures are detected at heliocentric distances, ranging from 0.13 to 0.66 au, in a total of 4-month time period. We find that flux ropes with field-aligned flows have certain properties similar to those of static flux ropes, such as the decaying relations of the magnetic fields within structures with respect to heliocentric distances. Moreover, these events are more likely with magnetic pressure dominating over the thermal pressure and occurring more frequently in the relatively fast-speed solar wind. Taking into account the high Alfvenicity, we also compare these events with switchbacks and present the cross-section maps via the new Grad-Shafranov type reconstruction. Finally, the possible evolution and relaxation of the magnetic flux rope structures are discussed.</p>

Tuning the Magnetic Alignment of Cellulose Nanocrystals from Perpendicular to Parallel Using Lepidocrocite Nanoparticles

2019 ◽  
Author(s):  
Valentina Guccini ◽  
Sugam Kumar ◽  
Yulia Trushkina ◽  
Gergely Nagy ◽  
Christina Schütz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cellulose Nanocrystals ◽  
Small Angle Neutron Scattering ◽  
Lower Amount ◽  
Magnetic Alignment ◽  
Polarized Optical Microscopy ◽  
Parallel Orientation ◽  
Weak Magnetic Fields

The magnetic alignment of cellulose nanocrystals (CNC) and lepidocrocite nanorods (LpN), pristine and in hybrid suspensions has been investigated using contrast-matched small-angle neutron scattering (SANS) under in situ magnetic fields (0 – 6.8 T) and polarized optical microscopy. The pristine CNC (diamagnetic) and pristine LpN (paramagnetic) align perpendicular and parallel to the direction of field, respectively. The alignment of both the nanoparticles in their hybrid suspensions depends on the relative amount of the two components (CNC and LpN) and strength of the applied magnetic field. In the presence of 10 wt% LpN and fields < 1.0 T, the CNC align parallel to the field. In the hybrid containing lower amount of LpN (1 wt%), the ordering of CNC is partially frustrated in all range of magnetic field. At the same time, the LpN shows both perpendicular and parallel orientation, in the presence of CNC. This study highlights that the natural perpendicular ordering of CNC can be switched to parallel by weak magnetic fields and the incorporation of paramagnetic nanoparticle as LpN, as well it gives a method to influence the orientation of LpN.<br>

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