SEOUL/MILAN, June 25 : Global chip stocks surged on Thursday after Micron Technology’s blockbuster results reignited the AI-driven rally, lifting tech shares from Seoul to Frankfurt as investors grew more confident about persistent demand and tightening supply. Micron, a key supplier for Nvidia's AI chipsets alongside South Korean chipmakers, forecast quarterly profit and revenue well above expectations on Wednesday and said its customers had committed $22 billion to lock in supplies of memory