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- W2019930092 abstract "Dynamic domain instability in magnetoresistive sensors produces noise in the output voltage pulses and forces complex head designs to suppress the irregular domain activities. In this paper, the micromagnetic modeling study of dynamic domain instability is presented. A Permalloy magnetoresistive sensor 10 μm in width, 2.5 μm in height, and 200 Å in thickness is modeled by a two dimensional array containing 512×128 cubic elements with identical intrinsic magnetic properties of Permalloy material. The Landau–Lifshitz equation is utilized for calculating the dynamic magnetic domain configurations as well as structures within domain walls. The study focuses on the transient processes that generate complex multidomain structures and the irregular dynamic domain activities. Figure 1 shows a simulated static ‘‘single’’ domain configuration, obtained by initially aligning the magnetization along the long axis of the Permalloy stripe. Circular edge domains are formed with patterns well agree with experimental observations. A high frequency (200 MHz) sinusoidal external field (amplitude 40 Oe) is then applied vertically with 10° deviation. Figure 2 shows the transient domain configuration at the time t=0.6T (T=period). The center portion of the stripe have become multidomain with irregular domain configuration and 180° Neel walls containing irregularly distributed Bloch lines and crossties. Note the irregularity of the domain configuration even though the material is homogeneous. The magnetization within the Neel walls alternates its direction along the walls. Detailed analysis of the onset of the multidomain state will be presented. Investigation of dynamic domain behavior under various bias schemes will be reported." @default.
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- W2019930092 modified "2023-10-16" @default.
- W2019930092 title "Micromagnetic study of dynamic domain instability in magnetoresistive sensors (abstract)" @default.
- W2019930092 doi "https://doi.org/10.1063/1.352710" @default.
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