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Orbital Reconstruction Enhanced Exchange Bias in La0.6Sr0.4MnO3/Orthorhombic YMnO3 Heterostructures.

Zheng D, Jin C, Li P, Wang L, Feng L, Mi W, Bai H - Sci Rep (2016)

Bottom Line: In this work, an orbital reconstruction enhanced exchange bias was discovered.As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO.The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

View Article: PubMed Central - PubMed

Affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China.

ABSTRACT
The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling. In this work, an orbital reconstruction enhanced exchange bias was discovered. As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO. The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

No MeSH data available.


Related in: MedlinePlus

Temperature dependent EB field in the LSMO(001)/YMO/STO heterostructures with different (a) LSMO and (b) YMO thicknesses, the inset shows the YMO thickness dependent EB field at 5 K.
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f3: Temperature dependent EB field in the LSMO(001)/YMO/STO heterostructures with different (a) LSMO and (b) YMO thicknesses, the inset shows the YMO thickness dependent EB field at 5 K.

Mentions: The LSMO and YMO thickness dependent EB in the LSMO(001)/YMO/STO heterostructures are shown in Fig. 3. For the EB induced by interfacial coupling, it is thickness dependent with the relation of HEB = −JEB/μoMFtF26 where JEB is the interfacial exchange coupling energy, tF and MF the thickness and saturation magnetization of the ferromagnetic layer. As shown in Fig. 3(a), similar to the situation in the YMO/LSMO/STO heterostructures19, the EB also decreases with the increasing thickness of LSMO layer. This behavior could be understood on the following points. On one hand, the EB is thickness dependent in ferromagnetic/antiferromagnetic heterostructures. On the other hand, the strain is thickness dependent. With the increasing thickness of LSMO layer, the strain decreases and the content of AFM order becomes lower.


Orbital Reconstruction Enhanced Exchange Bias in La0.6Sr0.4MnO3/Orthorhombic YMnO3 Heterostructures.

Zheng D, Jin C, Li P, Wang L, Feng L, Mi W, Bai H - Sci Rep (2016)

Temperature dependent EB field in the LSMO(001)/YMO/STO heterostructures with different (a) LSMO and (b) YMO thicknesses, the inset shows the YMO thickness dependent EB field at 5 K.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4836304&req=5

f3: Temperature dependent EB field in the LSMO(001)/YMO/STO heterostructures with different (a) LSMO and (b) YMO thicknesses, the inset shows the YMO thickness dependent EB field at 5 K.
Mentions: The LSMO and YMO thickness dependent EB in the LSMO(001)/YMO/STO heterostructures are shown in Fig. 3. For the EB induced by interfacial coupling, it is thickness dependent with the relation of HEB = −JEB/μoMFtF26 where JEB is the interfacial exchange coupling energy, tF and MF the thickness and saturation magnetization of the ferromagnetic layer. As shown in Fig. 3(a), similar to the situation in the YMO/LSMO/STO heterostructures19, the EB also decreases with the increasing thickness of LSMO layer. This behavior could be understood on the following points. On one hand, the EB is thickness dependent in ferromagnetic/antiferromagnetic heterostructures. On the other hand, the strain is thickness dependent. With the increasing thickness of LSMO layer, the strain decreases and the content of AFM order becomes lower.

Bottom Line: In this work, an orbital reconstruction enhanced exchange bias was discovered.As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO.The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

View Article: PubMed Central - PubMed

Affiliation: Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China.

ABSTRACT
The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling. In this work, an orbital reconstruction enhanced exchange bias was discovered. As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z(2) - r(2) and low energy x(2) - y(2) orbitals, which makes electrons occupy the localized x(2) - y(2) orbital and leads to the formation of antiferromagnetic phase in LSMO. The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.

No MeSH data available.


Related in: MedlinePlus