MAGNETIC PARTICLE AND THE FABRICATION METHOD THEREOF

摘要

PURPOSE: A magnetic particle and a manufacturing method thereof are provided to obtain a magnetic particle which can be specifically encoded and applied to security ink, thereby enabling effective and quick discrimination of forgery. CONSTITUTION: A magnetic particle sensitive to high energy comprises a magnetic core(100), a shell(300), and continuous or discontinuous void(200). The core is formed by dispersing and impregnating a plurality of super-paramagnetic nano particles in a dielectric material or polymer matrix. The continuous or discontinuous void is formed between the core and the shell. The shell includes metal or metal compound containing stable isotope. The gap or diameter of the void is 10nm or greater and the diameter of pores is 50nm or greater.