Dear Mr. Jagan,
Personnel Management has been founded by Robert Owen in the early 18's and HRM by George Elton Mayo in the early 19's.
Personnel Management mostly emphasized personnel and resource administration.
HRM is organized and updated form of Personnel Management which includes systematic and strategic approach of HR Operations like HR Administration, Recruitment and selection, Compensations and benefits, ER & IR, General Administration and on the side of OD it describes HR Planning, L & D, PMS & policy implementation and so on.
Sharing an organogram display which could help you for clear understanding.
Thanks
S.M.A Robin
HR Professional