This invention discloses a monolithic inductor including a body made by compressing a magnetic powder, a coil positioned in the body, and a permanent magnet positioned in the body and in a magnetic circuit formed by applying current to the coil. A specified hot-press process is performed on a steel plate member that, with respect to the chemical composition of the steel plate, includes: 0. The working tip includes i) a tapered section having a predetermined angle with respect to the longitudinal axis of the first cylindrical section, ii) a working face with a first annular chamfer formed at an outside portion of an end of the working tip and, iii) a second annular chamfer formed at an inside portion of the end of the working tip. The residue from water leaching is treated with sulphuric acid and Ti02 is precipitated via a hydrolysis route. the \u03b1-alumina nano powder is prepared by glycolating aluminium alkoxide in glycol solution containing the \u03b1-iron oxide or \u03b1-alumina nucleation seed and carrying out glyco thermal reaction. This invention also relates to the use of the above catalyst compound with an aluminum alkyl to polymerize olefins and other monomers.