As an Argentinian, you may stay in Germany (and anywhere else in Schengen) for a period of up to 90 days for pleasure or business. This means that, legally speaking, you're welcome to look for a job while you're there, as long as you do not actually work at a job without getting the appropriate visa.
In practice, though, when entering Germany, you'll want to have a return ticket back and state your purpose as tourism, because Immigration officers will usually assume that anybody who's looking for work on a tourist visa is also going to illegally work on that tourist visa.
See also this question about looking for work in the US, which is obviously a different country, but otherwise covers the same situation.
