scholarly journals Klein tunnelling and Hartman effect in graphene junctions with proximity exchange field

2019 ◽  
Vol 31 (22) ◽  
pp. 225302 ◽  
Author(s):  
J Tepper ◽  
J Barnaś
Keyword(s):  
Exchange Field ◽  
Hartman Effect

Magnetization dynamics of irradiation-fabricated perpendicularly magnetized dots inside a softer magnetic matrix

2003 ◽  
Vol 777 ◽  
Author(s):  
T. Devolder ◽  
M. Belmeguenai ◽  
C. Chappert ◽  
H. Bernas ◽  
Y. Suzuki
Keyword(s):  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Magnetization Reversal ◽  
Ion Irradiation ◽  
Magnetic Nanostructures ◽  
Magnetic Storage ◽  
Exchange Field ◽  
Static Magnetization ◽  
Specific Domain ◽  
Helium Ion

AbstractGlobal Helium ion irradiation can tune the magnetic properties of thin films, notably their magneto-crystalline anisotropy. Helium ion irradiation through nanofabricated masks can been used to produce sub-micron planar magnetic nanostructures of various types. Among these, perpendicularly magnetized dots in a matrix of weaker magnetic anisotropy are of special interest because their quasi-static magnetization reversal is nucleation-free and proceeds by a very specific domain wall injection from the magnetically “soft” matrix, which acts as a domain wall reservoir for the “hard” dot. This guarantees a remarkably weak coercivity dispersion. This new type of irradiation-fabricated magnetic device can also be designed to achieve high magnetic switching speeds, typically below 100 ps at a moderate applied field cost. The speed is obtained through the use of a very high effective magnetic field, and high resulting precession frequencies. During magnetization reversal, the effective field incorporates a significant exchange field, storing energy in the form of a domain wall surrounding a high magnetic anisotropy nanostructure's region of interest. The exchange field accelerates the reversal and lowers the cost in reversal field. Promising applications to magnetic storage are anticipated.

scholarly journals Detection of the interfacial exchange field at a ferromagnetic insulator-nonmagnetic metal interface with pure spin currents

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
P. K. Muduli ◽  
M. Kimata ◽  
Y. Omori ◽  
T. Wakamura ◽  
Saroj P. Dash ◽  
...  
Keyword(s):  
Pure Spin ◽  
Exchange Field ◽  
Metal Interface ◽  
Nonmagnetic Metal ◽  
Spin Currents

HIGH FIELD PHASE DIAGRAM OF THE FIELD-INDUCED SUPERCONDUCTING STATE OF λ-(BETS)2FeCl4

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3101-3104
Author(s):  
L. BALICAS ◽  
J. S. BROOKS ◽  
K. STORR ◽  
S. UJI ◽  
M. TOKUMOTO ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Superconducting State ◽  
Ground State ◽  
Electrical Transport ◽  
High Field ◽  
Two Dimensional ◽  
Exchange Field ◽  
Organic Conductor ◽  
Field Phase ◽  
Antiferromagnetic Ground State

We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor λ- (BETS) 2 FeCl 4. Below 4 K, antiferromagnetic-insulator, metallic, and eventually superconducting (FISC) ground states are observed with increasing in-plane magnetic field. The FISC state survives between 18 and 41 T, and can be interpreted in terms of the Jaccarino-Peter effect, where the external magnetic field compensates the exchange field of aligned Fe 3+ ions. We further argue that the Fe 3+ moments are essential to stabilize the resulting singlet, two-dimensional superconducting state. Here we provide experimental evidence indicating that this state, as well as the insulating antiferromagnetic ground state, is extremely sensitive to hydrostatic pressure.

Photo- and exchange-field controlled line-type resonant peaks and enhanced spin and valley polarizations in a magnetic WSe2 junction

2022 ◽  
Author(s):  
Mohammad Alipour zadeh ◽  
Yaser Hajati ◽  
Imam Makhfudz
Keyword(s):  
Transport Properties ◽  
Resonant Tunneling ◽  
High Efficiency ◽  
Oscillatory Behavior ◽  
Spin Orbit Coupling ◽  
Exchange Field ◽  
Ideal Line ◽  
Transmission Resonances ◽  
Filtering Effect ◽  
Line Type

Abstract Existing resonant tunneling modes in the shape of line-type resonances can improve the transport properties of the junction. Motivated by the unique structural properties of monolayer WSe2 e.g. significant spin-orbit coupling (SOC) and large direct bandgap, the transport properties of a normal/ferromagnetic/normal (NFN) WSe2 junction with large incident angles in the presence of exchange field (h), off-resonance light (∆Ω) and gate voltage (U) is studied. In a certain interval of U, the transmission shows a gap with optically controllable width, while outside it, the spin and valley resolved transmissions have an oscillatory behavior with respect to U. By applying ∆Ω (h), an optically (electrically) switchable perfect spin and valley polarizations at all angles of incidence have been found. For large incident angles, the transmission resonances change to spin-valley-dependent separated ideal line-type resonant peaks with respect to U, resulting in switchable perfect spin and valley polarizations, simultaneously. Furthermore, even in the absence of U, applying h or ∆Ω at large incident angles can give some spin-valley dependent ideal transmission peaks, making h or ∆Ω a transmission valve capable of giving a switchable fully spinvalley filtering effect. These findings suggest some alternate methods for providing high-efficiency spin and valley filtering devices based on WSe2.

scholarly journals Impact of Online Promoting Techniques on Moving Forward the Status of Businesses within the covid-19 Circumstance: Ghana as the Merging Point.

2021 ◽  
Vol 8 (9) ◽  
pp. 207-217
Author(s):  
ELVIS SELASE APHU ◽  
Ekor Sophia Enyonam Abra
Keyword(s):  
Competitive Advantage ◽  
Market Share ◽  
Exchange Field ◽  
The Status ◽  
Pros And Cons ◽  
Dynamic Cooperation ◽  
The Web

The expanding improvement of data innovation and communication has delivered a wide impact on commerce processes. The Web has made it conceivable to reach universal markets as the foremost successful means of electronic showcasing or marketing with worldwide scope. Be that as it may, in Ghana, numerous companies were ignorant of the need of utilizing different showcasing and online promoting strategies and their impacts on companies' circumstances until basic circumstances such as this so-called pandemic. This article looks at the definitions and standards of showcasing and online deals, e-commerce, their pros and cons to thrust companies and teach to utilize this kind of marketing and business. This ponder demonstrates that this sort of promoting and exchange as a vital and competitive advantage has contributed altogether to deals development and expanded the share of the inner and outside market share to Ghanaian companies within the competitive age. With the expanding world competition and the predominance of the Coronavirus, get to worldwide markets has gotten to be more complicated, and the require for modern worldwide devices and strategies can be of incredible offer assistance in this respect. The shrewd utilize of e-commerce innovation can offer assistance Ghanaian companies move forward exchange proficiency, make more dynamic cooperation within the worldwide exchange field and offer assistance fortify the country’s position on territorial and worldwide markets.

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