Abstract: There is provided a copper alloy backing tube formed of a copper alloy having a composition containing 0.10 mass % or more and 0.30 mass % or less of Co, 0.030 mass % or more and 0.10 mass % or less of P, 0.01 mass % or more and 0.50 mass % or less of Sn, 0.02 mass % or more and 0.10 mass % or less of Ni, and 0.01 mass % or more and 0.10 mass % or less of Zn. A copper balance containing impurities. A mass ratio [Co]/[P] is set to be within a range of 3.0 or higher and 6.0 or lower. A thermal conductivity is set to 250 W/(m·K) or higher. A micro-Vickers hardness after a heating treatment is performed in a condition of being held for one hour at 250° C. is 100 Hv or higher, and a decrease rate from a hardness before the heating treatment is set to 5% or less.

Abstract: Provided are a sputtering target for forming a magnetic recording medium film, on which a film having a low ordering temperature can be formed and which can suppress generation of particles, and a method for producing the same. The sputtering target for forming a magnetic recording medium film consists of a sintered body having a composition represented by the general formula: {(FexPt100-x)(100-y)Agy}(100-z)Cz, wherein x, y, and z are represented by atomic percent as 30?x?80, 1?y?30, and 3?z?63. Also, the method for producing the sputtering target has a step of hot pressing a mixed powder of AgPt alloy powder, FePt alloy powder, Pt powder, and graphite powder or carbon black powder in a vacuum or an inert gas atmosphere.