The Nikkei stock index briefly gained over 2 percent Friday morning, led by chip-related technology stocks tracking advances by their U.S. counterparts on hopes the world’s largest economy can achieve a soft landing. At 10 a.m., the 225-issue Nikkei Stock Average was up 689.96 points, or 1.86 percent, from Thursday at 37,845.29. The broader Topix index rose 35.05 points, or 1.34 percent, to 2,651.92.