Zero-magnetostriction and low field magnetic properties of Co-TM-Zr amorphous alloys (TM = V, Cr, Mo or W)

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Abstract
The formation range and zero‐magnetostrictive compositions for Co‐TM‐Zr (TM = V, Cr, Mo or W) amorphous alloys have been examined. And their low field magnetic properties also have been measured. The addition of TM elements extends the zirconium content forming amorphous single phase for Co‐Zr system to the range of 5–18 at%. The zero‐magnetostriction lines for all systems except for Co‐W‐Zr are located in the range of 7–15 at% TM. The crystallization temperature, Tx, for the alloys with Co less than 83 at% exceeds 500 °C, which is significantly higher than that for Co‐Fe‐Metalloids alloys. Increment of Co content in this type zero‐magnetostrictive alloys raises Curie temperature, Tc, and increases saturation magnetization monotonically, but decreases Tx slightly. The present alloys containing Co less than 82 at% exhibit excellent low field magnetic properties such as coercivity, Hc = 7 mOe in static field and effective permeability, μe(1 kHz, 10 mOe) = 34,800 for annealed Co77Cr11.7Zr11.3 amorphous alloy.