Giant Perpendicular Magnetic Anisotropy Enhancement in MgO-Based Magnetic Tunnel Junction by Using Co/Fe Composite Layer
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F21%3APU142032" target="_blank" >RIV/00216305:26620/21:PU142032 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.15.024017" target="_blank" >https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.15.024017</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevApplied.15.024017" target="_blank" >10.1103/PhysRevApplied.15.024017</a>
Alternative languages
Result language
angličtina
Original language name
Giant Perpendicular Magnetic Anisotropy Enhancement in MgO-Based Magnetic Tunnel Junction by Using Co/Fe Composite Layer
Original language description
Magnetic tunnel junctions with perpendicular anisotropy form the basis of the spin-transfer torque magnetic random-access memory (STT MRAM), which is nonvolatile, fast, dense, and has quasi-infinite write endurance and low power consumption. Based on density-functional-theory (DFT) calculations, we propose an alternative design of magnetic tunnel junctions comprising Fe(n)Co(m)Fe(n)|MgO storage layers [n and m denote the number of monolayers (ML)] with greatly enhanced perpendicular magnetic anisotropy (PMA) up to several mJ/m(2), leveraging the interfacial perpendicular anisotropy of Fe vertical bar MgO along with a strain-induced bulk PMA discovered within bcc Co. This giant enhancement dominates the demagnetizing energy when increasing the film thickness. The tunneling magnetoresistance (TMR) estimated from the Julliere model is comparable with that of the pure Fe vertical bar MgO case. We discuss the advantages and pitfalls of a real-life fabrication of the structure and propose the Fe(3ML)Co(4ML)Fe(3ML) as a storage layer for MgO-based STT MRAM cells. The large PMA in strained bcc Co is explained in the framework of second-order perturbation theory by the MgO-imposed strain and consequent changes in the energies of d(yz) and d(z2) minority-spin bands.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Applied
ISSN
2331-7019
e-ISSN
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Volume of the periodical
15
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
„024017-1“-„024017-8“
UT code for WoS article
000628653800001
EID of the result in the Scopus database
2-s2.0-85100901283