Beyond any new Iranian initiative, Araghchi's visit is significant on its own. He and other senior Iranian officials have repeatedly expressed willingness to work on reducing fears about Iran's nuclear aims since reformist Iranian President Hassan Rouhani took office in August.
Araghchi was a senior negotiator for Iran at Geneva talks earlier this month with six world powers that are seeking cuts in programs that Iran says serve only peaceful purposes but which could be re-engineered to make nuclear arms.
A new round in Geneva is scheduled for next week after both sides described the earlier talks as positive. Araghchi's meeting with Amano in Vienna could be interpreted as a symbol of Iranian interest in resolving the impasse on the IAEA probe in parallel with the six power talks.
While the Vienna and Geneva talks are formally separate, they are linked by concerns over Iran's nuclear aspirations, and progress in one may result in advances in the other.
The Vienna talks have been deadlocked for nearly two years, with agency experts seeking an open-ended probe and Iran insisting that it be carefully scripted with limits on what can be inspected, who can be questioned, and other constraints.
But officials from both sides spoke of a "constructive" meeting after the latest round last month. That assessment, and reports of progress in Geneva, are both seen as encouraging tests of pledges by Rouhani to reduce nuclear tensions.
As part of its probe, the IAEA is trying to gain access to a sector at Parchin, a sprawling military establishment southeast of Tehran. The agency suspects the site may have been used to test conventional explosive triggers meant to set off a nuclear blast.
Amano told reporters earlier this year he was concerned about satellite images showing asphalt work, soil removal and "possible dismantling of infrastructures" at the site.
Iran says such activities are part of regular construction that has nothing to do with alleged attempts to cleanse the area of evidence. But Amano said that because of such activities "it may no longer be possible to find anything, even if we have access to the site."
Vienna also is the venue this week of a meeting linked to the Geneva talks. Experts from Iran and on behalf of the United States, Russia, China, Britain, France and Germany, will confer Wednesday and Thursday on technical details for discussion at next week's Iran-six power round.
Iran is seeking relief from crippling economic sanctions in return for concessions on its nuclear program, and Iran's Press TV quoted Araghchi as saying that Iranian sanctions specialists will participate at the experts' meeting.