Exchange bias without directional anisotropy in permalloy/CoO bilayers

Mitrofanov, Alexander; Chen, Guanxiong; Kozhanov, Alexander; Urazhdin, Sergei

doi:10.1103/physrevb.104.144413

Cited by 5 publications

(5 citation statements)

References 52 publications

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“…Considering that the Magneto-optical Kerr effect is increasingly and widely used in studying magnetization dynamics, the structure and morphology of the magnetic materials [11,13,14,16], the application of the weak-value-amplification technique on detecting the Magneto-optical Kerr effect in the nanoscale layered structure is proposed. The Kerr rotation and the Kerr ellipticity can be simultaneously measured as the parameters of the pre-selection in the standard weak measurement.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Thus, the first application of the MOKE studied was ultra-thin Fe films grown epitaxially onto a single crystalline substrate of Au(100), and the MOKE loops for the Fe film with atomic layer sensitivity were successfully obtained as a function of film thickness and temperature [4]. Furthermore, with the rapid advancement of modern surface science and nano-engineering [5,6,7,8], the MOKE has been widely applied in studying the magnetization dynamics of magnetic materials [9,1,10,11], investigating the structure and morphology of the surface and interface [12,13,14,15,16], and even looking for the topological electromagnetic phase of matter [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Weak-value-amplification enhancement of the magneto-optical Kerr effect in nanoscale layered structures

Huang,

Lundeen,

Jordan

et al. 2023

Phys. Rev. A

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The achievement of the larger Magneto-optical Kerr rotations in nanoscale layered structures is extremely important for both theoretical understandings and practical applications. In this paper, we propose a scheme for simultaneously detecting the Kerr rotation and the Kerr ellipticity based on the weak-value amplification (WVA) technique. In the Magneto-optical Kerr effect study for the layered structure, the Kerr rotation and the Kerr ellipticity are obtained by calculating the boundary matrix and the transmission matrix of the layered structure. Then, the Kerr rotation and the Kerr ellipticity can be effectively amplified as the parameters of the pre-selection in the standard weak measurement. In addition, we numerically investigate the dependence of the thickness d of Co in the nanoscale layered structure HfO 2 (10 nm)/Co(d nm)/ HfO 2 (30 nm)/Al(40 nm)/Si films and the Co(d nm)/Si films at the measurement range of 5 nm < d < 50 nm. Simulation results confirmed that the Kerr rotation and the Kerr ellipticity can be effectively amplified by choosing the appropriate post-selected state, especially when the nanoscale layered structure shows no advantage for enhancing Kerr signals over the Co(d nm)/Si films without the weak-value-amplification technique. The realization of enhancement of Kerr signals in a nanoscale layered structure may have an important application in the magneto-optic (MO) parameters measurement and the MO properties in a more complex nanoscale structure.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Weak-value-amplification enhancement of the magneto-optical Kerr effect in nanoscale layered structures

Huang,

Lundeen,

Jordan

et al. 2023

Phys. Rev. A

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show abstract

Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Weak-value-amplification enhancement of the Magneto-optical Kerr effect in nanoscale layered structures

Huang

Lundeen

Dada

et al. 2022

Preprint

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The achievement of the larger Magneto-optical Kerr rotations in nanoscale layered structures is extremely important for both theoretical understandings and practical applications. In this paper, we propose a scheme for simultaneously detecting the Kerr rotation and the Kerr ellipticity based on the weak-value amplification (WVA) technique. In the Magneto-optical Kerr effect study for the layered structure, the Kerr rotation and the Kerr ellipticity are obtained by calculating the boundary matrix and the transmission matrix of the layered structure. Then, the Kerr rotation and the Kerr ellipticity can be effectively amplified as the parameters of the pre-selection in the standard weak measurement. In addition, we numerically investigate the dependence of the thickness d of Co in the nanoscale layered structure HfO2 (10~nm)/Co(d nm)/ HfO2 (30 nm)/Al(40 nm)Si films and the Co(d nm)Si films at the measurement range of 5 nm < d < 50 nm. Simulation results confirmed that the Kerr rotation and the Kerr ellipticity can be effectively amplified by choosing the appropriate post-selected state, especially when the nanoscale layered structure shows no advantage for enhancing Kerr signals over the Co(d nm)/Si films without the weak-value-amplification technique. The realization of enhancement of Kerr signals in a nanoscale layered structure may have an important application in the magneto-optic (MO) parameters measurement and the MO properties in a more complex nanoscale structure.

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“…Conventional methods to obtain CoO/Co with PMA use multilayer structures of AFM/FM/non-magnetic metal or metal oxide interfaces [ 27 , 28 , 29 ], but these methods may affect some magnetic parameters of CoO/Co, such as magnetization saturation ( M S ) and damping coefficient [ 28 , 30 ]. An alternative approach that has already proven its success with other materials, such as Co/Permalloy [ 31 , 32 ], consists of using antidot nanostructured templates, which allows tailoring the physical properties of any host-patterned material through the variation of its geometric parameters, such as the hole size and the neighboring interdistance [ 33 ]. In particular, it has been reported that, for FM/AFM antidot thin films, the coercivity and EB field can be engineered by controlling the thickness of the FM layer, the diameter of the pores, and the density of the pores [ 9 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size

et al. 2022

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The interest in magnetic nanostructures exhibiting perpendicular magnetic anisotropy and exchange bias (EB) effect has increased in recent years owing to their applications in a new generation of spintronic devices that combine several functionalities. We present a nanofabrication process used to induce a significant out-of-plane component of the magnetic easy axis and EB. In this study, 30 nm thick CoO/Co multilayers were deposited on nanostructured alumina templates with a broad range of pore diameters, 34 nm ≤ Dp ≤ 96 nm, maintaining the hexagonal lattice parameter at 107 nm. Increase of the exchange bias field (HEB) and the coercivity (HC) (12 times and 27 times, respectively) was observed in the nanostructured films compared to the non-patterned film. The marked dependence of HEB and HC with antidot hole diameters pinpoints an in-plane to out-of-plane changeover of the magnetic anisotropy at a nanohole diameter of ∼75 nm. Micromagnetic simulation shows the existence of antiferromagnetic layers that generate an exceptional magnetic configuration around the holes, named as antivortex-state. This configuration induces extra high-energy superdomain walls for edge-to-edge distance >27 nm and high-energy stripe magnetic domains below 27 nm, which could play an important role in the change of the magnetic easy axis towards the perpendicular direction.

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Exchange bias without directional anisotropy in permalloy/CoO bilayers

Cited by 5 publications

References 52 publications

Weak-value-amplification enhancement of the magneto-optical Kerr effect in nanoscale layered structures

Weak-value-amplification enhancement of the magneto-optical Kerr effect in nanoscale layered structures

Weak-value-amplification enhancement of the Magneto-optical Kerr effect in nanoscale layered structures

Enhancement of Exchange Bias and Perpendicular Magnetic Anisotropy in CoO/Co Multilayer Thin Films by Tuning the Alumina Template Nanohole Size

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