Asked by kelvin calin
Which is the best procedure to make a permanent magnet?
placing a magnetically hard material in a weak magnetic field
placing a magnetically hard material in a strong magnetic field
placing a magnetically soft material in a weak magnetic field
placing a magnetically soft material in a strong magnetic field
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Placing a magnetically hard material in a strong magnetic field.
Reason: permanent magnets require a material with high coercivity and retentivity (magnetically hard) so the domain alignment remains after the field is removed, and a strong field is needed to overcome anisotropy and pinning and to align the domains (ideally to saturation). Magnetically soft materials can be easily magnetized but lose their magnetization quickly, and a weak field won’t adequately align domains.
Reason: permanent magnets require a material with high coercivity and retentivity (magnetically hard) so the domain alignment remains after the field is removed, and a strong field is needed to overcome anisotropy and pinning and to align the domains (ideally to saturation). Magnetically soft materials can be easily magnetized but lose their magnetization quickly, and a weak field won’t adequately align domains.
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