An iron film percolation system is fabricated by vapour-phase deposition on fracture surfaces of α-Al2O3 ceramics.The zero-field-cooled (ZFC) and field-cooled (FC) magnetization measurement reveals that the magnetic phase of the film samples evolve from a high-temperature ferromagnetic state to a low-temperature spin-glass-like state,which is also demonstrated by the temperature-dependent ac susceptibility of the iron films.The temperature dependence of the exchange bias field He of the iron film exhibits a minimum peak around the temperature T=5K,which is independent of the magnitude of the cooling field Hcf.However,for T>10K,(1) He is always negative when Hcf=2kOe and (2) for Hcf=20kOe (1Oe≈80 A/m),He changes from negative to positive values as T increases.Our experimental results show that the anomalous hysteresis properties mainly result from the oxide surfaces of the films with spin-glass-like phase. An iron film percolation system is fabricated by vapor-phase deposition on fracture surfaces of a-Al2O3 ceramics. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization measurement reveals that the magnetic phase of the film samples evolve from a high-temperature ferromagnetic state to a low-temperature spin-glass-like state, which is also demonstrated by the temperature-dependent ac susceptibility of the iron films. The temperature dependence of the exchange bias field He of the iron film exhibits a minimum (1) He is always negative when Hcf = 2 kOe and (2) for Hcf = 20 kOe (1 Oe ≈ 80 A / m), He changes from negative to positive values ​​as T increases. Our experimental results show that the anomalous hysteresis properties mainly result from the oxide surfaces of the films with spin-glass-like phase.