Apple Inc is exploring new sources of the memory chips that go into iPhones, including its first Chinese producer of the critical component, after a disruption at a key Japanese partner exposed the risks to its global supply. It is considering expanding a roster of suppliers that already includes Micron Technology Inc and Samsung Electronics Co after Kioxia Holdings Corp in February lost a batch of output to contamination, people familiar with the matter said. While Samsung and SK Hynix Inc — the world’s largest makers of flash memory — are likely to pick up the slack, Apple remains keen...