Thickness and substrate effects on the perpendicular magnetic properties of ultra-thin TbFeCo films

Wang, Ke; Dong, Shuo; Xu, Zhixin

doi:10.1016/j.surfcoat.2018.12.087

Cited by 11 publications

(2 citation statements)

References 21 publications

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“…Meanwhile, in the thickness-dependent magnetization of γ′-Fe 4 N films at different bending strains, one can find that the M s in a thinner γ′-Fe 4 N film is larger, especially at a tensile or compressive strain of ROC = 3 mm. The larger M s in a thinner film (like the 3 nm-thick γ′-Fe 4 N film) may be associated with the formation of a magnetic FeN-dominant phase with a large magnetization. − As shown in Figure f,g, the maximum M s and minimum H c of the γ′-Fe 4 N film with different thicknesses appear at a tensile strain of ROC = 3 mm. Moreover, the in-plane M – H curves of the γ′-Fe 4 N film with different thicknesses at a compressive strain are shown in Figure a′–g′.…”

Section: Results and Discussionmentioning

confidence: 96%

Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe₄N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics

Shi

Lai

et al. 2020

ACS Appl. Mater. Interfaces

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The strain modulation on the magnetic and electronic transport properties of the ferromagnetic films is one of the hot topics due to the practical applications in flexible and wearable spintronic devices. However, the large strain-induced saturation magnetization and resistance change is not easy to achieve because most of the ferromagnetic films deposited on flexible substrates are polycrystalline or amorphous. Here, the flexible epitaxial γ′-Fe 4 N/mica films are fabricated by facing-target reactive sputtering. At a tensile strain with a radius of curvature (ROC) of 3 mm, the saturation magnetization (M s ) of the γ′-Fe 4 N/mica film is tailored significantly with a maximal variation of 210%. Meanwhile, the magnetic anisotropy was broadly tunable at different strains, where the out-of-plane M r /M s at a tensile strain of ROC = 2 mm is six times larger than that at the unbent state. Besides, the strain-tailored longitudinal resistance R xx and anomalous Hall resistivity ρ xy appear where the drop of R xx (ρ xy ) reaches 5% (22%) at a tensile strain of ROC = 3 mm. The shift of the nitrogen position in the γ′-Fe 4 N unit cell at different bending strains plays a key role in the strain-tailored magnetic and electronic transport properties. The flexible epitaxial γ′-Fe 4 N films have the potential applications in magneto-and electromechanical wearable spintronic devices.

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Section: Results and Discussionmentioning

confidence: 96%

Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe₄N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics

Shi

Lai

et al. 2020

ACS Appl. Mater. Interfaces

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“…As we know, Tb is a promising candidate rare earth material. Excellent tunable PMA and improved Curie temperature can be achieved when combining Tb with the TM materials. − We believe that the PMA of Tb/TM multilayer is mainly derived from the anisotropy of the Tb ions and the AF exchange coupling between Tb and TM spins, which should be closely related to each sublayer thickness and the thickness ratio of Tb and TM. Figure c presents a series of OP magnetic hysteresis loops, all showing a perpendicular easy axis for the multilayers with various Tb thicknesses.…”

Section: Resultsmentioning

confidence: 99%

Temperature Dependence of Magnetic Properties in CoFe/Tb Multilayers with Perpendicular Magnetic Anisotropy

Zhang

Ren

et al. 2022

ACS Appl. Electron. Mater.

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Rare earth/transition metal multilayers with tunable net magnetization (M net ) and perpendicular magnetic anisotropy (PMA) are potential systems for achieving devices with high speed and density. In this paper, we perform a detailed study on the temperature (T) and thickness dependences of perpendicular magnetic properties in [Co 80 Fe 20 (0.45 nm)/Tb (x = 0.3−0.95 nm)] 5 multilayers. The strong antiferromagnetic (AF) interaction between Tb and CoFe spins is demonstrated at the interfaces, and the magnetization compensation thickness (at which M net tends to zero) is determined as x ∼ 0.6 nm at room temperature. Whether the multilayer is Tbrich or CoFe-rich, an increasing trend in magnetic coercivity is found with the decrease in T, demonstrating that the M net of the AF-coupled region is always dominated by CoFe in this structure. Furthermore, the transient polar MOKE signals were also measured at elevated T by using laser pulse heating. With the increase in pump fluence, the original rectangle loop changes to a two-step switching shape for the sample with 0.4 nm Tb due to the decreased PMA strength and increased interfacial atomic diffusion. However, for the multilayer with 0.9 nm Tb that is farther from compensation, the loop becomes very inclined since the PMA is relatively weak and nearly vanishes upon laser impulsion. These results provide a deep insight into the key roles of sublayer thicknesses and interfaces, which are very helpful for achieving efficient control of the spintronic devices based on the AF-coupled materials.

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Fabrication of TbFeCo alloy films with tunable perpendicular coercivity evaluated by extraordinary Hall effect measurements

et al. 2020

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Thickness and substrate effects on the perpendicular magnetic properties of ultra-thin TbFeCo films

Cited by 11 publications

References 21 publications

Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe₄N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics

Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe₄N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics

Temperature Dependence of Magnetic Properties in CoFe/Tb Multilayers with Perpendicular Magnetic Anisotropy

Fabrication of TbFeCo alloy films with tunable perpendicular coercivity evaluated by extraordinary Hall effect measurements

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Thickness and substrate effects on the perpendicular magnetic properties of ultra-thin TbFeCo films

Cited by 11 publications

References 21 publications

Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe4N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics

Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe4N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics

Temperature Dependence of Magnetic Properties in CoFe/Tb Multilayers with Perpendicular Magnetic Anisotropy

Fabrication of TbFeCo alloy films with tunable perpendicular coercivity evaluated by extraordinary Hall effect measurements

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Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe₄N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics

Bending Strain-Tailored Magnetic and Electronic Transport Properties of Reactively Sputtered γ′-Fe₄N/Muscovite Epitaxial Heterostructures toward Flexible Spintronics