Hello,
The active log file itself itself is not removed due to log archiving. When log archiving finishes, the log file in the active log path will be 'marked' as re-usable. When it is re-used, the file name will be changed accordinly.
You may consider to book a elearning session (can be seen on the homepage of DB6 SCN).
Hope it gives more details on how DB6 works.
Kind regards
Maria