Highly likely it's gone for good depending on how much you used the drive after formatting. If it was a fresh format and you never used the drive after and worked off a cloned image, you'd have better chances. You may be better off having someone that does digital forensics clone and see if they can recover. Someone that knows how to use tools like The Sleuth Kit will be able to recover it if it still exists. Autopsy is more user friendly if you want to try on your own: http://www.sleuthkit.org/autopsy/