Compositional Dependence of Exchange Anisotropy in Pt$_x$Mn$_{100-}$$_x$/Co$_y$Fe$_{100-}$$_y$ Films

Ranjbar, Sina; Tsunoda, Masakiyo; Al‐Mahdawi, Muftah; Oogane, Mikihiko; Ando, Yasuo

doi:10.1109/lmag.2019.2940674

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Since EB is an interfacial phenomenon, the surface roughness may affect the magnitude of the exchange bias [19,42,43]. Hence, the effect of the Tb content on the surface morphology of Tb x Co 100−x /Cu(0.2)/[Co(0.4)/Pt(2)] 2 heterostructures was investigated using AFM.…”

Section: Resultsmentioning

confidence: 99%

“…The exchange anisotropy energy is generally revealed by the exchange energy, σ Pw , which is the stabilizing energy per unit area of the FM/AFM or ferrimagnet (FIM)/FM interfaces, H ex = J k M s t = σ Pw 2M s t , where M s and t FM are the saturation magnetization and thickness of the FM layer, respectively [14,15]. However, typical AFM/FM systems indicate a limitation in attaining large EB fields (usually below 1 KOe) [16][17][18], which correlates to challenges in fabricating fine AFM crystals, controlling the AFM domain state, and uncompensated spin moments at the interface [16,17,19]. Thus, it seems that these cannot provide the reasonable necessities for future spintronic applications.…”

Section: Introductionmentioning

confidence: 99%

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Large Perpendicular Exchange Energy in TbxCo100−x/Cu(t)/[Co/Pt]2 Heterostructures

Ranjbar¹,

Sumi²,

Tanabe³

et al. 2021

Magnetochemistry

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In order to realize a perpendicular exchange bias for applications, a robust and tunable exchange bias is required for spintronic applications. Here, we show the perpendicular exchange energy (PEE) in the TbxCo100−x/Cu/[Co/Pt]2 heterostructures. The structure consists of amorphous ferrimagnetic Tb–Co alloy films and ferromagnetic Co/Pt multilayers. The dependence of the PEE on the interlayer thickness of Cu and the composition of Tb–Co were analyzed. We demonstrate that the PEE can be controlled by changing the Cu interlayer thickness of 0.2 < tCu < 0.3 (nm). We found that PEE reaches a maximum value (σPw = 1 erg/cm2) at around x = 24%. We, therefore, realize the mechanism of PEE in the TbxCo100−x/Cu/[Co/Pt]2 heterostructures. We observe two competing mechanisms—one leading to an increase and the other to a decrease—which corresponds to the effect of Tb content on saturation magnetization and the coercivity of heterostructures. Sequentially, our findings show possibilities for both pinned layers in spintronics and memory device applications by producing large PEE and controlled PEE by Cu thickness, based on TbxCo100−x/Cu/[Co/Pt]2 heterostructures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large Perpendicular Exchange Energy in TbxCo100−x/Cu(t)/[Co/Pt]2 Heterostructures

Ranjbar¹,

Sumi²,

Tanabe³

et al. 2021

Magnetochemistry

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Correlating spin freezing and magnetic properties in [Co/Ni]n/PtMn multilayers

Lee

et al. 2020

Journal of Magnetism and Magnetic Materials

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Controlling domain configuration of the sensing layer for magnetic tunneling junctions by using exchange bias

et al. 2020

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The control of magnetic domain formation and fluctuations in the sensing layer is important to progress for low noise in magnetic tunnel junction sensors. We studied the effect of exchange bias on the domain structure in micro-patterned Permalloy (Py: Ni80Fe20) sensing layer. We deposited single Py films, and Pt48Mn52/Py films, where the latter showed exchange bias. By controlling the thickness of Py, Pt48Mn52 (15nm)/Py (t=235 nm) showed a small coercivity and exchange bias of 7 Oe. After micro-fabrication into circular pillars 80 µm in diameter, we measured the domain structure by Magneto Optical Kerr Effect (MOKE) microscopy. MOKE images showed that single Py pillars have a simple closure domain, where the domain wall at the center moved with the applied field. The exchange-biased Py pillars exhibited a more complicated structure, but with fixed domains at the center region due to the exchange bias overcoming the magnetostatic energy. The uniform rotation of magnetization at the center of the sample is promising for decreasing the domain hopping magnetic noise.

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Compositional Dependence of Exchange Anisotropy in Pt$_x$Mn$_{100-}$$_x$/Co$_y$Fe$_{100-}$$_y$ Films

Cited by 5 publications

References 34 publications

Large Perpendicular Exchange Energy in TbxCo100−x/Cu(t)/[Co/Pt]2 Heterostructures

Large Perpendicular Exchange Energy in TbxCo100−x/Cu(t)/[Co/Pt]2 Heterostructures

Correlating spin freezing and magnetic properties in [Co/Ni]n/PtMn multilayers

Controlling domain configuration of the sensing layer for magnetic tunneling junctions by using exchange bias

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