Magnetic and noise properties of as-deposited and annealed soft underlayer

• Published in: Journal of magnetism and magnetic materials Vol. 311; no. 2; pp. 671 - 674
• Main Authors: Yoon, Seong Yong, Lee, Hoo San, Kong, Sok Hyun, Oh, Hoon Sang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2007; Elsevier Science
• Subjects: Complex or multidomain patterns; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures); IrMn; Magnetic filed annealing; Magnetic properties and materials; Magnetic properties of surface, thin films and multilayers; Magnetic recording materials; Noise properties; Physics; Soft underlayer; Studies of specific magnetic materials; Magnetic filed annealing; 75.50.sS; IrMn; Noise properties; Soft underlayer; Complex or multidomain patterns; Magnesium alloys; Magnetic annealing; Magnetic noise; Ferromagnetic materials; Magnetic hysteresis; Subshell; Experimental study; Magnetic force microscopy; Interfaces; Binary alloys; Hysteresis loop; Bias voltage; Wave forms; Exchange interactions; Magnetic properties
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2006.08.032

We studied the magnetic and noise properties with various soft underlayer (SUL) types. For an as-deposited SUL, the results of spectrum, oscilloscope waveform and MFM indicated that the SUL types with IrMn pinning layer have more noise level than that of SUL types without IrMn pinning layer. And, after magnetic filed annealing along radial direction of disk, the exchange bias field increased and the noise level of type B (exchange bias type) decreased. These results reveal that incomplete or partial coupling may be generated at the interface between IrMn and ferromagnetic layer in as-deposited SUL. This incomplete coupling may result in complex or multidomain patterns in ferromagnetic layer.