As noted in section 1.2.3, the AGFM is a force instrument, comprising of 3
component parts. Firstly, the instrument must be capable of applying a known
magnetic field to the sample. Methods of generating fields of various strengths
have been well covered in the literature [1, 2]. Secondly, the instrument must
have a controllable source of alternating field gradient. This has conventionally
been achieved with coils of appropriate geometry, carrying an alternating
current, and is described in more detail in section 2.2.1. Finally, the resulting
oscillatory force on the sample has to be detected, usually by attaching the
sample to a mechanically compliant system and measuring the displacement.
Many of the previously reported systems have operated at a mechanical
resonance, thereby greatly enhancing the displacement. This is covered in more
detail in sections 2.2.2, and 2.2.3.
As noted in section 1.2.3, the AGFM is a force instrument, comprising of 3 component parts. Firstly, the instrument must be capable of applying a known magnetic field to the sample. Methods of generating fields of various strengths have been well covered in the literature [1, 2]. Secondly, the instrument must have a controllable source of alternating field gradient. This has conventionally been achieved with coils of appropriate geometry, carrying an alternating current, and is described in more detail in section 2.2.1. Finally, the resulting oscillatory force on the sample has to be detected, usually by attaching the sample to a mechanically compliant system and measuring the displacement. Many of the previously reported systems have operated at a mechanical resonance, thereby greatly enhancing the displacement. This is covered in more detail in sections 2.2.2, and 2.2.3.
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