For minimalist Nordic style, what works best is combining natural materials with clean lines. Black metal is fine if it's really simple and geometric, but honestly natural wood is going to give you more warmth in the space without losing that Nordic essence. The ideal would be to look for something with a light wood structure (oak, birch) combined with a shade in white, gray, or linen fabric. If you want metal, go for matte finishes rather than shiny ones, and keep the structure as minimalist as possible without unnecessary ornaments.
As for decent Spanish brands, you've got options beyond Ikea that won't break the bank. Choose one that goes for simple design without pretensions: brands like Woodstock or some small regional shops usually have good proposals at reasonable prices. The key is that the shade is made from natural material (linen, cotton) and that the height is proportioned to your living room, without sticking out too much or looking too small. Make sure it has a good anchoring system if you have kids or pets at home, because floor lamps can be a bit unstable with any bump.