Unexpected exchange bias behaviour in CoFeB ultrathin films for MTJ sensors investigated by Lorentz microscopy

Bellini, Eleonora; McVitie, S.; MacLaren, Donald A.; O’Shea, K.; Chapman, J. N.; Cao, Jiangwei; Cardoso, S.

doi:10.1088/0022-3727/46/30/305001

Cited by 1 publication

(1 citation statement)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exchange bias (EB) effect has been extensively studied due to its critical role in the spintronic devices such as spin‐valves, magnetic tunnel junction, giant magnetoresistive sensors, after it was found by Meiklejohn and Bean in Co/CoO core–shell structures . The exchange bias usually exhibits a shift of hysteresis loop along the direction of the magnetic field, which originates from the interfacial coupling between the ferromagnetic layer and the antiferromagnetic layer .…”

Section: Introductionmentioning

confidence: 99%

Exchange Bias Effect in Epitaxial LaMnO_3+δ Film Induced by Electron Beam Irradiation

Xue

Ding

Lai

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

Phase separation in the perovskite manganites of R1‐xAxMnO3 (R = trivalent lanthanide cation and A = divalent alkaline‐earth cation) can induce novel phenomena associated with the interfacial interactions. Here, the occurrence of phase separation and unexpected exchange bias induced by electron beam irradiation (EBI) in the epitaxial LaMnO3+δ (LMO) thin films is reported. The transformation from Mn4+ ion to Mn3+ ion originating from the electron's reducibility, enhances the Mn3+–Mn3+ antiferromagnetic superexchange interaction, resulting in phase separation, namely, the coexistence of ferromagnetic matrix and antiferromagnetic clusters. The formation of the antiferromagnetic phase in the LMO film is closely related to the increase of the out‐of‐plane lattice constant and the decrease of Curie temperature after EBI. The unexpected exchange bias effect results from the interfacial interaction between the ferromagnetic matrix and antiferromagnetic clusters, triggered by EBI in LMO film. The discovery of exchange bias induced by EBI shed promising light on achieving the tunable exchange bias effect in spintronic devices for single‐phase films.

show abstract

Section: Introductionmentioning

confidence: 99%

Exchange Bias Effect in Epitaxial LaMnO_3+δ Film Induced by Electron Beam Irradiation

Xue

Ding

Lai

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

Unexpected exchange bias behaviour in CoFeB ultrathin films for MTJ sensors investigated by Lorentz microscopy

Cited by 1 publication

References 31 publications

Exchange Bias Effect in Epitaxial LaMnO_3+δ Film Induced by Electron Beam Irradiation

Exchange Bias Effect in Epitaxial LaMnO_3+δ Film Induced by Electron Beam Irradiation

Contact Info

Product

Resources

About

Unexpected exchange bias behaviour in CoFeB ultrathin films for MTJ sensors investigated by Lorentz microscopy

Cited by 1 publication

References 31 publications

Exchange Bias Effect in Epitaxial LaMnO3+δ Film Induced by Electron Beam Irradiation

Exchange Bias Effect in Epitaxial LaMnO3+δ Film Induced by Electron Beam Irradiation

Contact Info

Product

Resources

About

Exchange Bias Effect in Epitaxial LaMnO_3+δ Film Induced by Electron Beam Irradiation

Exchange Bias Effect in Epitaxial LaMnO_3+δ Film Induced by Electron Beam Irradiation