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Enhanced voltage-controlled magnetic anisotropy via magnetoelasticity in FePt/MgO(001)
The interplay between magnetoelectricity and magnetoelasticity (MEL) is studied in the context of voltage-controlled magnetic anisotropy (VCMA). Strain plays more than the role of changing lattice constants-that of the internal electric field in the heterostructure. As a prototype, FePt/MgO(001) is...
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Published in: | Physical review. B 2020-06, Vol.101 (21), Article 214436 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The interplay between magnetoelectricity and magnetoelasticity (MEL) is studied in the context of voltage-controlled magnetic anisotropy (VCMA). Strain plays more than the role of changing lattice constants-that of the internal electric field in the heterostructure. As a prototype, FePt/MgO(001) is visited, where the behavior of two interfaces are drastically different: one exhibits switching, the other does not. Whether an external electric field (Eext) is present or not, we found the VCMA coefficient larger than 1 pJ / ( V m ) as a consequence of the rearrangement of d orbitals with m = ± 1 and ± 2 in response to an external electric field. In addition, magnetocrystalline anisotropy is analyzed with strain taken into account, where a nonlinear feature is presented, only accountable by invoking second-order MEL. |
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ISSN: | 2469-9950 2469-9969 |
DOI: | 10.1103/PhysRevB.101.214436 |