Non-magnetic single crystal Mn--Zn ferrite for floating type magnetic heads

A magnetic head assembly comprising:

• a slider body comprising a non-magnetic single crystal of Mn--Zn ferrite obtained by a solid phase reaction process including the steps of contacting a seed single crystal ferrite with a polycrystal crystal ferrite and producing the non-magnetic single crystal by growing the single crystal in a direction from the seed single crystal toward the polycrystal crystal under heating, said single crystal of Mn--Zn ferrite having a porosity of not more than 0.005%, a Curie point not higher than -50.degree. C. and a composition defined by points A, B, C and D in a three-phase diagram of Fe.sub.2 O.sub.3 --MnO--ZnO, in which:
• A:
• Fe.sub.2 O.sub.3 40 mol %, MnO 10 mol %, ZnO 50 mol %;
• B:
• Fe.sub.2 O.sub.3 40 mol %, MnO 22 mol %, ZnO 38 mol %;
• C:
• Fe.sub.2 O.sub.3 60 mol %, MnO 2 mol %, ZnO 38 mol %;
• D:
• Fe.sub.2 O.sub.3 48 mol %, MnO 2 mol %, ZnO 50 mol %;
• and
• at least one magnetic head formed on one end of said slider body.