I would steer clear of the landscape rake. I've not ever found them that useful period, but I guess they work ok on loose aggregate. Anything very large or hung in the ground, tines bend and break.
If I were clearing rocks, I'd probably rent a rock bucket and a compact track loader. Lots more power and tractive effort than a small compact tractor, and should be able to clear a 0.6 spot in an easy half-day if it is indeed arable land.