Magnetic AC loss of a mono-Sr_0.6K_0.4Fe₂As₂ tape/Ag in perpendicular field

The magnetic AC losses of monofilament Sr_0.6K_0.4Fe₂As₂/Ag tapes are measured in the temperature range between 20 K and 30 K both in perpendicular and parallel field. The loss, measured by the standard magnetization technique, is determined from the area of the hysteresis loop using a vibrating sample magnetometer (VSM) in a cyclic field of amplitude up to 7 T. The results in perpendicular field are compared to that of the parallel-field loss and theoretical calculation of magnetization loss at various temperatures. There is a reasonable agreement between the theoretical model and the experimental results even in high field. The magnetic critical current density ( J_c) of the tape, obtained by the magnetic hysteresis measurements M(H), are investigated in two field directions and in the temperature range from 5 K to 30 K. The comparison between the magnetic J_c in both field directions and the transport J_c of the tape are also done at various temperatures and fields. The anisotropy of J_c (Γ=J_c ^ab/J_c ^c) is very small.