We report broadband, multimode microwave absorption in obliquely sputtered Permalloy films where the in-plane anisotropy is tuned by deposition geometry. As the sputtering angle approaches normal incidence, the films evolve from uniform in-plane magnetization to well-ordered stripe domains (SDs), accompanied by a transition from single-peak ferromagnetic resonance to up to seven resolvable modes with bandwidths up to 5.0 GHz and average spectral granularity less than 1.0 GHz (configuration dependent). Angle- and field-resolved measurements under orthogonal ($h_{\mathrm{rf}}$ ⊥ H) and parallel ($h_{\mathrm{rf}}$ ∥ H) geometries reveal mode families associated with domain precession and domain-wall dynamics, including geometry-driven conversions between acoustic-like and optical-like branches. Micromagnetic simulations reproduce the domain evolution, the emergence and suppression of modes with field, and the configuration selectivity, establishing in-plane anisotropy as a deterministic control parameter that sets the SD texture and its high-frequency response. The results provide a lithography-free, wafer-compatible route to tunable, multifrequency, broadband magnetic functionality for microwave, sensing, and spintronic applications.

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• Magnetic anisotropy
• Magnetic domains
• Magnetic susceptibility
• Magnetization dynamics
• Spin optoelectronics
• Magnetic thin films
• Soft magnets
• Microwave techniques