Memory chipmakers are switching to a new metal to keep stacking flash chips higher — good news for equipment makers and for SK Hynix, which is ahead in the race.

• Flash memory chips stopped shrinking sideways a decade ago and now stack in layers, but past 300 layers the tungsten wiring inside gets too resistive and leaky.
• Molybdenum conducts better at tiny scales, leaks less, and fits into the ultra-deep holes, letting chipmakers pack more storage into the same silicon.
• SK Hynix leads at 321 layers and plans 375 by year-end, while Micron and Samsung sit in the 270–290 range and Kioxia and SanDisk trail at 218.
• The switch creates a new market for deposition machines — worth over $1 billion next year and double that by 2030 — with Lam Research first out of the gate.
• Memory makers can afford the upgrade: the top five flash brands saw combined sales jump sharply last quarter.

Outlook: Expect the industry to push past 400 layers as molybdenum grows from a niche process to about a third of flash production by 2027, leaving China's YMTC further behind.