Spaniards do not need a visa to visit Argentina, nor do nationals of other Latin American countries. On the other hand, to work in the trans-Andean country, they must apply for the corresponding work visa, in addition to providing a work contract signed by their employer. In the case of students, the visa is granted for periods of 12 months. You have all the information in: «Tips, documentation and requirements to travel to Argentina«.
You have all the information in: "Tips, documentation and requirements to travel to Argentina".