FINEMET core’s magnetic properties, “B-H curve” can be controlled by applying a magnetic field during annealing.  There are three types of B-H curves with the Finemet cores.
 
1) H type: a magnetic field is applied in a circumferential direction during annealing.

2) M type: no magnetic field is applied during annealing.

3) L type: a magnetic field is applied vertically to the core plane during annealing.

On page 2 of the Finemet intro PDF brochure, http://www.overunity.com/index.php?action=downloads;sa=downfile&id=362 in regards to the "L type", you will see the Bsat to be 0.57T when the drive field is H_max=8 A/m while the Bsat is 1.23T when the drive field is H_max=800 A/m.

There are three types of B-H curve squareness; high, middle,and low remanence ratio corresponding to various applications.  With this material, we'll be dealing with hard disc drive tolerances, does this ring a bell?


It is no mistake.


GB

I'm trying to get my circuit working with a UGN3503 sensor.

For the future, you should note that this device is no longer
being made. I think the replacement is the A1302. (Allegro).

FINEMET core’s magnetic properties, “B-H curve” can be controlled by applying a magnetic field during annealing.  There are three types of B-H curve squareness with the Finemet cores.
 
1) H type: a magnetic field is applied in a circumferential direction during annealing.

2) M type: no magnetic field is applied during annealing.

3) L type: a magnetic field is applied vertically to the core plane during annealing.

On page 2 of the Finemet intro PDF brochure, http://www.overunity.com/index.php?action=downloads;sa=downfile&id=362 in regards to the "L type", you will see the Bsat to be 0.57T when the drive field is H_max=8 A/m while the Bsat is 1.23T when the drive field is H_max=800 A/m.

There are three types of B-H curve squareness; high, middle,and low remanence ratio.  With this material, we'll be dealing with hard disc drive tolerances, does this ring a bell?


It is no mistake.


GB

Nice find GB. So the Bsat can vary between 0.57T to 1.23T depending on the FINEMET core type. Anyway I don't really think we need it for the replication project. 1.23 T is too much and 0.57T is just fine - so metglas would be just fine.

As for the fence wire coil project - what is the purpose of it ?? I don't really find in it anything to do with ORBO project (if there is any sense in it at all (other than being "cool")). So I would simply suggest setting up a new thread with it.

Browsing through the MetGlas and FineMet applications, one common application mentioned is magnetic amplifiers or in short MAG AMPs.
Simple introduction: http://en.wikipedia.org/wiki/Magnetic_amplifier.
If you look at the principles of magnetic amplifiers you can see the resemblance with Orbo. Instead of the control DC current used in magnetic amplifiers the external magnetic field is applied.
Magnetic amplifiers amplify current.
There's lots of stuff on the internet available on MAG AMPs.

[edit]
Looks like here's also the basis for the SSOrbo, the solid state version of Orbo.
If you put a permanent magnet accurately positioned next to the toroid coil this substitutes the DC control of a MAG AMP.

Nice find GB. So the Bsat can vary between 0.57T to 1.23T depending on the FINEMET core type. Anyway I don't really think we need it for the replication project. 1.23 T is too much and 0.57T is just fine - so metglas would be just fine.

In the conventional soft magnetic materials, “whose grain size is far larger than 1μm”, it was well known that soft magnetic properties become worse and coercive force increases when crystal grain size becomes smaller. For example, coercive force is thought to be inversely proportional to D.  Therefore, main efforts to improve the soft magnetic properties were directed to make the crystal grain size larger and/or to make the magnetic domain size smaller by annealing and working.

However, FINEMET demonstrated a new phenomenon; reduction of grain size, “to a nano-meter level”, improves the soft magnetic properties drastically.  In this nano-world, the coercive force is directly proportional to D on the order of D² to D⁶. This is absolutely contrary to the conventional concepts for improving the soft magnetic properties.

In this nano-world of FINEMET, the coercive force is directly proportional to D on the order of D² to D⁶, while in the conventional soft magnetic materials the coercive force is thought to be inversely proportional to D.  It sounds like FINEMET is much more softer than the Metglas.

If Metglas doesn't have the Aharonov–Bohm effect and is not as soft as FINEMET, then the Metglas may not be just fine.  Don't forget, the bread crumbs on researching the Aharonov–Bohm effect has led me to the FINEMET.  I also think the Aharonov–Bohm effect is the Orbo effect.  It appears FINEMET is a very soft material, which may be what Steorn is referring to when he says a soft material.

IMO, the FINEMET is a better candidate for the Orbo effect than the Metglas.  I've been wrong many times, but FINEMET does look more promising to me.  Neither one needs to be ruled out, and both needs to be tested.

[Edit:]  The information contained within this post can be found on Page 8 of the "Intro Finemet brochure" that I provided a link to in my previous post.

 
GB

beautiful GB Lets read it...

woopy i meant no harm to you ;] I just said this thread is about replicating and nothing more. There is a solid state ORBO like device thread so maybe there should be one for yours ;> But do as you wish.

In the conventional soft magnetic materials, “whose grain size is far larger than 1μm”, it was well known that soft magnetic properties become worse and coercive force increases when crystal grain size becomes smaller. For example, coercive force is thought to be inversely proportional to D.  Therefore, main efforts to improve the soft magnetic properties were directed to make the crystal grain size larger and/or to make the magnetic domain size smaller by annealing and working.

However, FINEMET demonstrated a new phenomenon; reduction of grain size, “to a nano-meter level”, improves the soft magnetic properties drastically.  In this nano-world, the coercive force is directly proportional to D on the order of D² to D⁶. This is absolutely contrary to the conventional concepts for improving the soft magnetic properties.

In this nano-world of FINEMET, the coercive force is directly proportional to D on the order of D² to D⁶, while in the conventional soft magnetic materials the coercive force is thought to be inversely proportional to D.  It sounds like FINEMET is much more softer than the Metglas.

If Metglas doesn't have the Aharonov–Bohm effect and is not as soft as FINEMET, then the Metglas may not be just fine.  Don't forget, the bread crumbs on researching the Aharonov–Bohm effect has led me to the FINEMET.  I also think the Aharonov–Bohm effect is the Orbo effect.  It appears FINEMET is a very soft material, which may be what Steorn is referring to when he says a soft material.

IMO, the FINEMET is a better candidate for the Orbo effect than the Metglas.  I've been wrong many times, but FINEMET does look more promising to me.  Neither one needs to be ruled out, and both needs to be tested.

[Edit:]  The information contained within this post can be found on Page 8 of the "Intro Finemet brochure" that I provided a link to in my previous post.

 
GB

Metglas sells Finemet. Actually I own a lot of Finemet & Metglas cores, and Metglas has the highest magnetic permeability. Which cores works the best, I have no idea, but my measurements already show that the Metglas MAGAMP core in the "tiny orbo replication" was ~ COP 2.  

IMO the excess energy effect will appear in either Metglas or Finemet.

As far as the Aharonov–Bohm effect, come on. Please study about the effect because scientists have been researching it for ages, and it is a ridiculously difficult weak effect to even measure.