scholarly journals On the speed of piezostrain-mediated voltage-driven perpendicular magnetization reversal: a computational elastodynamics-micromagnetic phase-field study

2017 ◽  
Vol 9 (7) ◽  
pp. e404-e404 ◽  
Author(s):  
Ren-Ci Peng ◽  
Jia-Mian Hu ◽  
Long-Qing Chen ◽  
Ce-Wen Nan
Keyword(s):  
Magnetization Reversal ◽  
Voltage Pulse ◽  
Magnetic Domain ◽  
Domain Wall Motion ◽  
Thermal Fluctuations ◽  
Local Magnetization ◽  
Switching Speed ◽  
Perpendicular Magnetization ◽  
Pzt Film ◽  
Computational Analyses

Abstract By linking the dynamics of local piezostrain to the dynamics of local magnetization, we computationally analyzed the speed of a recently proposed scheme of piezostrain-mediated perpendicular magnetization reversal driven by a voltage pulse in magnetoelectric heterostructures. We used a model heterostructure consisting of an elliptical ultrathin amorphous Co20Fe60B20 on top of a polycrystalline Pb(Zr,Ti)O3 (PZT) thin film. We constructed a diagram showing the speed of perpendicular magnetization reversal as a function of the amplitude of the applied voltage pulse and the stiffness damping coefficient of PZT film. In addition, we investigated the influence of thermal fluctuations on the switching speed. The analyses suggest that the switching time remains well below 10 ns and that the energy dissipation per switching is on the order of femtojoule. The present computational analyses can be generally used to predict the speed of piezostrain-enabled magnetization switching and magnetic domain-wall motion, which critically determines the response time of corresponding piezostrain-enabled spintronic and magnonic devices.

scholarly journals Воздействие поля зонда магнитно-силового микроскопа на скирмионное состояние в модифицированной пленке Co/Pt с перпендикулярной анизотропией

2019 ◽  
Vol 61 (9) ◽  
pp. 1644
Author(s):  
В.Л. Миронов ◽  
Р.В. Горев ◽  
О.Л. Ермолаева ◽  
Н.С. Гусев ◽  
Ю.В. Петров
Keyword(s):  
Magnetization Reversal ◽  
Magnetic Force ◽  
Ion Beam ◽  
Magnetic Force Microscope ◽  
Local Magnetization ◽  
Probe Field ◽  
Micromagnetic Simulations ◽  
Perpendicular Magnetization ◽  
Magnetic Skyrmions ◽  
Microscope Probe

We present the experimental magnetization reversal of artificial magnetic skyrmions in a Co/Pt multilayer film with perpendicular magnetization by a magnetic force microscope probe. The sample was a Co/Pt film containing an array of cylindrical regions with reduced anisotropy, which were modified by a focused He+ ion beam. The magnetic state of the sample was monitored by magnetic force microscopy. The local magnetization reversal was performed by the field of magnetic force microscope probe passing over the sample at low height. The effects of magnetostatic interaction between the probe field and skyrmion magnetization in these structures are investigated by micromagnetic simulations.

Domains and domain nucleation in magnetron-sputtered CoCr thin films

1993 ◽  
Vol 51 ◽  
pp. 1046-1047
Author(s):  
B. G. Demczyk
Keyword(s):  
Thin Films ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Domain Size ◽  
Film Plane ◽  
Magnetic Domain Structure ◽  
Perpendicular Magnetization ◽  
Columnar Grains ◽  
Reversal Mechanism ◽  
Lorentz Transmission Electron Microscopy

CoCr thin films have been of interest for a number of years due to their strong perpendicular anisotropy, favoring magnetization normal to the film plane. The microstructure and magnetic properties of CoCr films prepared by both rf and magnetron sputtering have been examined in detail. By comparison, however, relatively few systematic studies of the magnetic domain structure and its relation to the observed film microstructure have been reported. In addition, questions still remain as to the operative magnetization reversal mechanism in different film thickness regimes. In this work, the magnetic domain structure in magnetron sputtered Co-22 at.%Cr thin films of known microstructure were examined by Lorentz transmission electron microscopy. Additionally, domain nucleation studies were undertaken via in-situ heating experiments.It was found that the 50 nm thick films, which are comprised of columnar grains, display a “dot” type domain configuration (Figure 1d), characteristic of a perpendicular magnetization. The domain size was found to be on the order of a few structural columns in diameter.

scholarly journals Magnetic properties of (Bi1−xLax)(Fe,Co)O3 films fabricated by a pulsed DC reactive sputtering and demonstration of magnetization reversal by electric field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Munusamy Kuppan ◽  
Daichi Yamamoto ◽  
Genta Egawa ◽  
Sivaperuman Kalainathan ◽  
Satoru Yoshimura
Keyword(s):  
Electric Field ◽  
Magnetization Reversal ◽  
High Performance ◽  
Magnetic Domain ◽  
Magnetic Film ◽  
Film Plane ◽  
Force Microscopy ◽  
Domain Structures ◽  
Pulsed Dc ◽  
Submicron Scale

Abstract(Bi1−xLax)(Fe,Co)O3 multiferroic magnetic film were fabricated using pulsed DC (direct current) sputtering technique and demonstrated magnetization reversal by applied electric field. The fabricated (Bi0.41La0.59)(Fe0.75Co0.25)O3 films exhibited hysteresis curves of both ferromagnetic and ferroelectric behavior. The saturated magnetization (Ms) of the multiferroic film was about 70 emu/cm3. The squareness (S) (= remanent magnetization (Mr)/Ms) and coercivity (Hc) of perpendicular to film plane are 0.64 and 4.2 kOe which are larger compared with films in parallel to film plane of 0.5 and 2.5 kOe. The electric and magnetic domain structures of the (Bi0.41La0.59)(Fe0.75Co0.25)O3 film analyzed by electric force microscopy (EFM) and magnetic force microscopy (MFM) were clearly induced with submicron scale by applying a local electric field. This magnetization reversal indicates the future realization of high performance magnetic device with low power consumption.

scholarly journals Perpendicular magnetization reversal in Pt/[Co/Ni]3/Al multilayers via the spin Hall effect of Pt

2016 ◽  
Vol 108 (8) ◽  
pp. 082406 ◽  
Author(s):  
J.-C. Rojas-Sánchez ◽  
P. Laczkowski ◽  
J. Sampaio ◽  
S. Collin ◽  
K. Bouzehouane ◽  
...  
Keyword(s):  
Hall Effect ◽  
Magnetization Reversal ◽  
Spin Hall Effect ◽  
Perpendicular Magnetization

scholarly journals Electric field control of magnetic domain wall motion via modulation of the Dzyaloshinskii-Moriya interaction

2018 ◽  
Vol 4 (12) ◽  
pp. eaav0265 ◽  
Author(s):  
Tomohiro Koyama ◽  
Yoshinobu Nakatani ◽  
Jun’ichi Ieda ◽  
Daichi Chiba
Keyword(s):  
Domain Wall ◽  
Electric Field ◽  
Magnetic Domain ◽  
Domain Wall Motion ◽  
Asymmetric Structure ◽  
Velocity Change ◽  
Spintronic Devices ◽  
Electrical Manipulation ◽  
Substantial Change ◽  
Moriya Interaction

We show that the electric field (EF) can control the domain wall (DW) velocity in a Pt/Co/Pd asymmetric structure. With the application of a gate voltage, a substantial change in DW velocity up to 50 m/s is observed, which is much greater than that observed in previous studies. Moreover, modulation of a DW velocity exceeding 100 m/s is demonstrated in this study. An EF-induced change in the interfacial Dzyaloshinskii-Moriya interaction (DMI) up to several percent is found to be the origin of the velocity modulation. The DMI-mediated velocity change shown here is a fundamentally different mechanism from that caused by EF-induced anisotropy modulation. Our results will pave the way for the electrical manipulation of spin structures and dynamics via DMI control, which can enhance the performance of spintronic devices.

Magnetic domain patterns on strong perpendicular magnetization of Co/Ni multilayers as spintronics materials: II. Numerical simulations

2013 ◽  
Vol 25 (39) ◽  
pp. 395005 ◽  
Author(s):  
Kazue Kudo ◽  
Masahiko Suzuki ◽  
Kazuki Kojima ◽  
Tsuneo Yasue ◽  
Noriko Akutsu ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Magnetic Domain ◽  
Perpendicular Magnetization

Observations of Magnetic Domain Structure Change in Nd2Fe14B Magnets at Elevated Temperature with External Magnetic Field by Lorentz Microscopy

2015 ◽  
Vol 1754 ◽  
pp. 31-36 ◽  
Author(s):  
Toshimasa Suzuki ◽  
Koichi Kawahara ◽  
Haruka Tanaka ◽  
Kimihiro Ozaki
Keyword(s):  
Elevated Temperature ◽  
Domain Wall ◽  
Wall Motion ◽  
Magnetic Domain ◽  
Domain Wall Motion ◽  
Magnetic Domain Wall ◽  
Lorentz Microscopy ◽  
Pinning Effect ◽  
In Situ Observations

ABSTRACTIn this study, we conducted the in-situ observations of the magnetic domain structure change in Nd2Fe14B magnets at elevated temperature by transmission electron microscopy (TEM) / Lorentz microscopy. The in-situ observations in Nd2Fe14B magnets revealed that the magnetization reversal easily occurred at the elevated temperature. At more than 180°C, the magnetic domain wall motion could be observed by applying the magnetic field of less than 20 mT. The motion of the magnetic domain wall was discontinuous and the domain wall jumped to one grain boundary to the neighboring grain boundary at 180°C. On the other hand, the continuous domain wall motion within grain interior as well as discontinuous domain wall motion was observed at 225°C, and some grain boundaries showed still strong pinning effect even at 225°C. The temperature dependence of the pinning effect of grain boundaries would not uniform.

Dependence of Magnetic Domain-Wall Motion on a Fast Changing Current

2009 ◽  
Vol 103 (19) ◽  
Author(s):  
Lars Bocklage ◽  
Benjamin Krüger ◽  
Toru Matsuyama ◽  
Markus Bolte ◽  
Ulrich Merkt ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Magnetic Domain ◽  
Domain Wall Motion ◽  
Magnetic Domain Wall
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