Magnetic properties and thermal stability of electroplated NiFeCr and NiFeMo films with high resistivity

Author

Hoshino, K. ; Sano, M. ; Narumi, S. ; Fuyama, M.

Author_Institution

Central Res. Lab., Hitachi Ltd., Ibaraki, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3433

Lastpage

3435

Abstract

The magnetic properties and resistivity of electroplated Ni₄₅Fe₅₅ films with added Cr or Mo were investigated in order to obtain write head materials with high resistivity for high frequency (a few hundred MHz) regions. The high resistivity of 60 μΩ cm and high magnetic flux density of 1.5T were obtained when 1.5at% of Cr or Mo were added to electroplated Ni₄₅Fe₅₅ films. The thermal stability and corrosion resistance of NiFe(Cr, Mo) films were the same as those of NiFe films. Furthermore, domain structures of the NiFe and NiFeCr top write-head core were observed. The easy axis of annealed films easily switched towards the track width direction in the head-yoke geometry

Keywords

annealing; chromium alloys; corrosion resistance; electrical resistivity; electroplated coatings; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic cores; magnetic domains; magnetic heads; magnetic switching; magnetic thin films; molybdenum alloys; nickel alloys; soft magnetic materials; thermal stability; 1.5 T; 2 MHz; 60 muohmcm; NiFeCr; NiFeMo; NiFeMo films; annealed films; corrosion resistance; domain structures; easy axis; electroplated Ni₄₅Fe₅₅ films; electroplated NiFeCr film; head-yoke geometry; high frequency; high magnetic flux density; high resistivity; magnetic properties; resistivity; thermal stability; top write-head core; track width direction; write head materials; Chromium; Conductivity; Frequency; Iron; Magnetic films; Magnetic heads; Magnetic materials; Magnetic properties; Thermal resistance; Thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800548

Filename

800548