Exchange bias of ferromagnetic/antiferromagnetic in FePt/FeRh bilayers

Nam, Nguyen Thanh; Lü, Wei; Suzuki, Takao

doi:10.1063/1.3062813

Cited by 31 publications

(12 citation statements)

References 14 publications

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“…The value of out-of-plane coercivity is around 7 kOe and it is clear that the coupling between FeRh layer and FePt layer is antiferromagnetic/ferromagnetic interaction. Consequently, there is an exchange bias effect in the hysteresis loops at low temperature, as reported in previous studies [10]. It can be seen from Fig.…”

Section: Magnetic Propertiessupporting

confidence: 50%

Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films

Lü

Chen

et al. 2012

Appl. Phys. A

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In this paper, (001) textured FeRh/FePt bilayer thin film was fabricated by sputtering and the temperaturedependent magnetic behavior of FePt/FeRh bilayers was investigated in detail. The magnetic regime passes from exchange bias to exchange spring when the temperature increases from low to high, resulting from the first-order antiferromagnetic (AFM) to ferromagnetic (FM) phase transition in ordered FeRh alloy layer. Controlling the temperature-allowed modification of the hysteresis loops of exchange-spring-like FeRh/FePt bilayer due to the nanoscale soft/hard interface exchange coupling, our experimental results clearly show that the coercive field decreases strongly at the temperature where FeRh completely transforms to ferromagnetic state. In an exchange-spring-like FeRh/FePt bilayer film, the out-of-plane magnetization reversal process was in two steps and resulted from domain wall nucleation and propagation from the FeRh layer into the FePt layer.

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Section: Magnetic Propertiessupporting

confidence: 50%

Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films

Lü

Chen

et al. 2012

Appl. Phys. A

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“…2,3 The existence of this transition just above room temperature (RT)-near 350 K-makes FeRh a unique model system, which is still of significant interest in the physics and materials science community. [4][5][6][7][8][9] It has been proposed as a candidate material for heat-assisted magnetic recording (HAMR), where it would be coupled to ferromagnetic layers, [10][11][12] as well as for magnetocaloric cooling. In most of the thin-film studies, both fundamental and applied, FeRh is capped with a thin film layer to protect against oxidation, commonly a noble metal (Au, Pt) or a light selfpassivating metal such as Al.…”

Section: Introductionmentioning

confidence: 99%

Effect of capping material on interfacial ferromagnetism in FeRh thin films

Baldasseroni

Pálsson

Bordel

et al. 2014

Journal of Applied Physics

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The role of the capping material in stabilizing a thin ferromagnetic layer at the interface between a FeRh film and cap in the nominally antiferromagnetic phase at room temperature was studied by x-ray magnetic circular dichroism in photoemission electron microscopy and polarized neutron reflectivity. These techniques were used to determine the presence or absence of interfacial ferromagnetism (FM) in films capped with different oxides and metals. Chemically stable oxide caps do not generate any interfacial FM while the effect of metallic caps depends on the element, showing that interfacial FM is due to metallic interdiffusion and the formation of a ternary alloy with a modified antiferromagnetic to ferromagnetic transition temperature. V

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“…In 2009, Nam et al introduced the FePt alloy film as a FM-layer, which was coupled with FeRh (AFM-layer) for use in PEB systems. 12,13 In 2011, Kosub et al observed the PEB phenomenon at 10 K in CoO/Co 3 Pt bilayers. 14 However, the PEB that is caused by an alloy single-layered thin film with PMA has been rarely examined.…”

mentioning

confidence: 98%

Perpendicular exchange bias behaviors of CoPt/IrMn and CoPt/FeMn bilayers: A comparative study

Tsai

Hsu

Lin

2015

Journal of Applied Physics

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In this study, FeMn was introduced as an antiferromagnetic (AFM) layer to couple with a single-layered Co49Pt51 alloy thin film, and it was compared with a Co49Pt51/IrMn bilayer system in exchange bias (EB) effect, to explore the mechanism of spontaneous perpendicular exchange bias (PEB), which has been recently observed in CoPt/IrMn bilayers. Bilayers of CoPt/IrMn and CoPt/FeMn were prepared under the same conditions by sputtering at room temperature without any inducing field. Although PEB was observed in as-grown CoPt/FeMn bilayers, the loop shape and PEB behavior were found to exhibit different characteristics from those of CoPt/IrMn bilayers. The CoPt (5 nm)/FeMn (10 nm) bilayer has a sheared loop that is similar to a double-shifted loop and a much lower squareness ratio (SQR = 0.52) and exchange bias field (He = 180 Oe) than the CoPt (5 nm)/IrMn (10 nm) system, which has a rectangular loop shape and a high SQR of 0.97 and large He of 290 Oe. The two systems present entirely different dependences of PEB on the thickness of the AFM layer. CoPt/IrMn exhibits behavior that is typical of most EB systems, but for CoPt/FeMn, this dependence is more complicated with an unusual peak at an AFM layer thickness of 10 nm. Based on the dissimilar loop shapes and dependences of PEB on AFM thickness, the mechanisms of the spontaneously established PEB in these two systems are considered to differ. Investigations of cross-sectional transmission electron microscopy revealed no apparent difference between the interfacial microstructures of the two systems. X-ray diffraction studies demonstrated the ⟨111⟩ texture of both systems. Therefore, different interfacial spin configurations may be responsible for the dissimilar PEB behaviors in these two FM/AFM bilayer systems.

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Exchange bias of ferromagnetic/antiferromagnetic in FePt/FeRh bilayers

Cited by 31 publications

References 14 publications

Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films

Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films

Effect of capping material on interfacial ferromagnetism in FeRh thin films

Perpendicular exchange bias behaviors of CoPt/IrMn and CoPt/FeMn bilayers: A comparative study

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