Effect of magnetic field annealing on microstructure and magnetic properties of FePt films

Li, Y.B.; Lou, Yuanfu; Zhang, L.R.; Ma, Bin; Bai, Junfeng; Wei, Fulin

doi:10.1016/j.jmmm.2010.07.047

Cited by 23 publications

(4 citation statements)

References 25 publications

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“…Increase in the hardness in the FePt layer with temperature is in accordance with several studies [21,24,36], whereas in the present case preferential alignment of the magnetic moments along the H MAX direction is due to the magnetic field, which has been applied during annealing and cooling of the sample to RT. It is also in accordance with the earlier studies [27,28], where annealing of FePt films in an external magnetic field around the T c (~753 K) of the L1 0 phase led to the preferential alignment of the magnetic spins in the FePt film due to thermal disturbance, which is close to the exchange energy of the magnetization of the film. Ex-situ XRD and VSM-SQUID measurements (discussed later) were used to further confirm the hard magnetic phase in the FePt layer.…”

Section: Resultssupporting

confidence: 92%

“…The Curie temper atures for the disordered and ordered FePt are about 603 and 753 K [25,26], respectively. Therefore, cooling of the sample from a temperature of about 823 K to RT, in the presence of an in-plane magnetic field of about 1500 Oe, will not only promote the disorder-order transformation of the FePt films but is sufficient to align magnetic spins of the layer in its remanent state [27,28]. FePt (L1 0 )/FeCo bilayer structure is prepared by subsequent deposition of ~13 nm thick FeCo layer on FePt film using an electron beam evaporation technique in the same UHV chamber.…”

Section: Methodsmentioning

confidence: 99%

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Exchange bias effect in L1₀-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field

Singh¹,

Kumar²,

Bhagat³

et al. 2018

J. Phys. D: Appl. Phys.

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The applied magnetic field (HAPP) dependence of the exchange bias (EB) is studied in an exchange-coupled thin-film bilayer composed of a hard ferromagnetic FePt layer in the proximity of a soft ferromagnetic FeCo layer. FePt/FeCo structure is deposited in an ultra-high vacuum chamber, where the FePt layer was first annealed at 823 K for 30 min and subsequently cooled to room temperature in the presence of an in-plane magnetic field, HMAX ~ 1.5 kOe to promote L10-ordered hard magnetic phase with magnetic moments aligned in one of the in-plane directions in the FePt layer. In-situ magneto-optical Kerr effect measurements during different stages of bilayer growth and detailed ex-situ superconducting quantum interference device-vibrating sample magnetometer measurements jointly revealed that due to the interplay between exchange coupling at the interface and dipolar energies of the saturated hard FePt layer, a hysteresis loop of FeCo layer shifts along the magnetic field axis. A clear dependence of EB field (HEB) on increasing maximum value of the HAPP during the hysteresis loop measurement is understood in terms of the magnetic state of soft and hard magnetic layers, where EB increases with increasing HAPP until the hard layer moment remains undisturbed in its remanence state. As soon as the field was sufficient to rotate the spins of the FePt layer, the loop became symmetric with respect to the field axis.

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Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Exchange bias effect in L1₀-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field

Singh¹,

Kumar²,

Bhagat³

et al. 2018

J. Phys. D: Appl. Phys.

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“…This means that the benefit effect of magneto-electrodeposition on a nanocrystalline film can be completely consumed by a thermal exposure at relatively low temperature [7]. Magnetic field annealing has been confirmed to be useful for tailoring the microstructure of as-deposited nanocrystalline films for their widespread uses [8]. Markou et al [9] obtained a high-degree (001) texture in L1 0 CoPt films by annealing Co/Pt bilayers in a perpendicular magnetic field of 1 kOe.…”

Section: High Magnetic Field Annealing Dependent On the Morphology Anmentioning

confidence: 99%

The Coupled Magnetic Field Effects on the Microstructure Evolution and Magnetic Properties of As-Deposited and Post- Annealed Nano-Scaled Co-Based Films — Part I

Li¹,

Wang²,

Frańczak³

et al. 2015

Electroplating of Nanostructures

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Superimposed external magnetic fields during electrodeposition process offers the possibility to tailor microstructure and properties of the obtained films in a very efficient, contactless, and easily controllable way, what is caused by so-called magnetohydrodynamic MHD effect. On the other hand, the nonequilibrium state of aselectrodeposited nanocrystalline films provides a strong thermodynamic potential for microstructural transformation. This means that the benefit effect of magneto-electrodeposition on a nanocrystalline film can be completely consumed by a thermal exposure at relatively low temperature. Magnetic field annealing has been confirmed to be useful for tailoring the microstructure of as-deposited nanocrystalline films for their widespread uses.The particular interest of this book Chapter Growth of Co-based magnetic thin films by magnetic fields MF assisted electrodeposition and heat treatment is the finding that the microstructure and magnetic properties of nanocrystalline Co-based alloys and oxides like CoX X= Cu, Ni, NiP, FeO are improved by imposition of MF during elaboration process or post-annealing process. "ccording to the previous study, the targeted scientific activities pay more attention to develop alloys and oxides in nanoscale using pulsed electrodeposition assisted by high magnetic field HMF . Note Since the instantaneous current density during pulse electrodeposition is higher than that during direct current plating, the microstructure of the nano-scale electrodeposits can be more easily controlled by perturbing the desorption/adsorption processes occurring in the pulse electrodeposition process .During the experiment, high magnetic field is an in-situ method for the control of electrodeposition process. The obtained material is then annealed or oxidized after

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“…Nowadays, research has suggested that magnetic field annealing is useful for tailoring the microstructure of the as-deposited nanocrystalline films [14,15]. Li et al [16] demonstrated that using magnetic field annealing around the Curie temperature can obtain preferential orientation (001) and perpendicular anisotropy in FePt films. Markou et al [17] established that high degree (001) texture in L1 0 CoPt films can be obtained by annealing Co/Pt bilayers in a perpendicular magnetic field of 1 k Oe.…”

Section: Introductionmentioning

confidence: 99%

Effects of High Magnetic Field Postannealing on Microstructure and Properties of Pulse Electrodeposited Co-Ni-P Films

Wang

et al. 2016

Advances in Materials Science and Engineering

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The influence of high magnetic field annealing on the morphology, microstructure, and properties of pulsed-electrodeposited Co-Ni-P films was investigated. The as-deposited film with a rough surface changed into uniform nanocrystalline during the magnetic field annealing process. In particular, the formation of intestine-like appearance with spherical clusters vanishing is favored from a moderate magnetic field strength of 6 T, due to the polarized effects. Meantime, the diffraction peak (111) of α (fcc) phase shifts to the right direction, which is attributed to the fact that more Co atoms from phosphide phase are incorporated into the Ni lattice, in comparison with the case of annealing under 0 T and 12 T magnetic fields. The mechanical and magnetic properties of the films reach relative optimum values at B=6 T. The evolution of magneto-induced modification in the Co-Ni-P morphology, structure, and properties can be explained by the polarized effect and the diffusion-acceleration effect under a high magnetic field.

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Effect of magnetic field annealing on microstructure and magnetic properties of FePt films

Cited by 23 publications

References 25 publications

Exchange bias effect in L1₀-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field

Exchange bias effect in L1₀-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field

The Coupled Magnetic Field Effects on the Microstructure Evolution and Magnetic Properties of As-Deposited and Post- Annealed Nano-Scaled Co-Based Films — Part I

Effects of High Magnetic Field Postannealing on Microstructure and Properties of Pulse Electrodeposited Co-Ni-P Films

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Effect of magnetic field annealing on microstructure and magnetic properties of FePt films

Cited by 23 publications

References 25 publications

Exchange bias effect in L10-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field

Exchange bias effect in L10-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field

The Coupled Magnetic Field Effects on the Microstructure Evolution and Magnetic Properties of As-Deposited and Post- Annealed Nano-Scaled Co-Based Films — Part I

Effects of High Magnetic Field Postannealing on Microstructure and Properties of Pulse Electrodeposited Co-Ni-P Films

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Exchange bias effect in L1₀-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field

Exchange bias effect in L1₀-ordered FePt and FeCo-based bilayer structure: effect of increasing applied field