| abstract |
PROBLEM TO BE SOLVED: To provide a magnetic recording medium further improving thermal stability and electromagnetic conversion characteristics. A magnetic recording medium is a magnetic recording medium having a magnetic layer containing magnetic powder, a base layer and a base layer in this order, and the average thickness tT of the magnetic recording medium is 5.6 μm or less, and the base layer is , Polyesters, the thermal stability of the magnetic recording medium KuVact / kBT is 63 or more, and the magnetic interaction ΔM calculated by the following formula (1) of the magnetic layer is −0.362 ≦ ΔM ≦ −0. It is .22. ΔM = {Id (H) + 2Ir (H) -Ir (∞)} / Ir (∞) ... (1) [In equation (1), Id (H) is DC demagnetized and measured residual magnetization. Ir (H) is the remanent magnetization measured by alternating current demagnetization, and Ir (∞) is the remanence magnetization measured with the applied magnetic field as 6 kOe. ] [Selection diagram] Fig. 5 |